Trish De la Rosa/Season 3

Road Trips & Reunions
Still on tour with Dez and Austin, Trish helps encourage Ally into joining them on tour. When she and Dez meet Ally though, Austin is missing because of him getting back on the wrong bus at night. But eventually, the foursome are back together. Ally ends up staying on tour which satisfies Trish as well as Dez and Austin.

What Ifs & Where's Austin
When imagining what their lives would be like without Austin around, Trish ends up being signed to Starr Records for her talent of singing, but becomes the diva popstar, which makes her lose her fame, her record deal, and her best friend, Ally. But, during all this, Dez is her personal assistant and is the only one she has left. She admits that he's more than just a friend, and the two kiss. After that, Ally, Trish, and Dez stop the imagination sequence in conclusion that their lives would've been terrible for if Austin was not around.

Presidents & Problems
After being awakened by another one of Dez's attempts to be helpful, Trish shows that she bought hats at every stop to remember the tour and bought tea cups for Ally. After Austin's ceremony, Ally notices that Trish kept checking her phone to which Trish responds that she's working on something big for Austin's career. When visiting the Smithsonian Museum, Austin ends up with the silver shoes from the Wizard of Oz stuck on his feet. Austin says that they should just confess, but Trish doesn't agree because Austin doesn't need that kind of bad publicity. When they go back to the museum to confess and see all the cameras, Trish defends Austin by saying how he is a Teen Role Model but she almost gives him up when she realizes there is a reward for who ever catches the thief. Back in the stockroom, after Ally gives her idea of mailing the shoes back anonymously, Trish's reveals that Austin is going to be playing for the President of the United States. When Austin brings her attention back to the shoes, Trish says that he can't cancel on the President but then Ally gives an idea of hiding them. During the concert when Austin admits what happened and the President gives him pardon. Trish tries to gain pardon too, because she scratched his limousine.

Beach Clubs & BFFs
Upon returning from tour, Trish becomes jealous of Ally and Kira's developing friendship, in which they have a lot in common. To make matters worse, Kira starts to take over as Ally's manager, booking her a performance at Shredder's Beach Club. Though, after Ally and Trish go through a conflict involving a roasted pig spinning out of control, they eventually do make up. Ally gets to sing Redial at Shredder's, which was written for Trish.

Mix Ups & Mistletoes
In an attempt to gain a promotion as Party Planner for her job at Shredder's, Trish plans a Christmas party for the kids at the orphanage. In order to get much of the work done, Trish manipulates Chuck and Dez to do nearly everything for her when they duke out in their rivalry. Meanwhile, her and the rest of the gang anticipate the coming of Christmas, especially because of the news of the Austin Moon Doll that every kid happens to want. Though, the dolls turn out to have major flaws to which the four try to fix, but are unable to stop. But, by the end, thanks to a Christmas miracle of delivered fixed dolls, everyone's Christmas turn out well, as Trish does get the promotion. The only problem to that is there is no raise, only more working hours.

Glee Clubs & Glory
Trish, a member of Marino High's Glee Club faces a conflict with the rest of the group concerning the type of "style" to perform as in order to win the regionals competition. Both Austin and Ally have their own ways of wanting to settle things, but instead of compromise, a rivalry breaks out, having Trish and a few others join Austin's side while the rest plus Dez side with Ally. But, during an argument between the two, they both get kicked out of the club, leaving Trish with the rest of the group to compete. Eventually, after they make up, Trish gets Coach Simmons to let Austin and Ally back on the team, and the group wins the competition after performing the Austin & Ally Glee Club Mash Up.

Austin & Alias
While Austin and Ally face the main conflict of having another songwriter, Dez bargains with Trish that he will give her the gift card she wanted to an animal print store after a week. But the catch is that Trish is not supposed to insult Dez in any way, for if she does, Dez will go back to the store to buy something. The less Trish insults Dez, the more money there will be left on the card when she eventually gets it. Throughout the week, she struggles to keep up with the little bargain, and by the end, she ultimately loses it after Dez accidentally spills a drink on her. This causes her to lash out at him, to Dez's satisfaction. There's barely any money left on the card when it's all over, also resulting in Dez having a bizarre outfit, completely covered in animal print, thanks to Trish's insults.

Princesses & Prizes
Helping out with recovering lost time and money from Ally's bake sale disaster, Trish hosts as the auctioneer at the Austin Moon auction. When auctioning off for a date with Austin, Trish and the rest of the gang that the winner is a beautiful girl that everyone seems to admire, Chelsea. While Dez and Ally and Austin and Chelsea are salsa dancing at the beach club later on, Trish simply goes on with her job. A while later, she is shown to have to be helping out with Chelsea's little sister's birthday party at Shredder's by having to dress up as a joker.

Cupids & Cuties
After experiencing a disastrous date with Jace - a guy she and the rest of Team Austin met back during their tour - Trish seeks help from Dr. Cupid. His advice works, but when Trish discovers that Dr. Cupid is really Dez, whom she at first refused love advice from, she is shocked. But, she does end up getting Dez a radio interview as Dr. Cupid in order for people to get know him better. Even when the interview doesn't go as planned, she shows sympathy for him, partially due to her newfound relationship with Jace. When Dez is finally back on his game, Trish once again asks Dez for his help, to which he gladly accepts for her.

Critics & Confidence
When Austin essentially loses his confidence after a couple of bad reviews from Kenneth Kreen, Trish is one who attempts to assist him in gaining that back. She tries to lead him through a meditation session that she believes will regain some of that confidence, but accidentally says things over a bluetooth that may have made him instead believe that he is not as great he seems to really be. However, she is able to get Kenneth Kreen to stay at the beach club for just enough time for Ally to talk to Austin into performing for him once again. Though while Trish and the others loved Austin's performance as usual and are glad that he's back to his old self, Kreen still does not seem to admire him. But nevertheless, Trish still supports Austin in his career and knows that he is the real deal.

Directors & Divas
Coming into Sonic Boom with Austin, Trish reveals to Ally and Dez that she had been able to get the two plus Austin jobs on the set of the new Spike Stevens movie: The Pilot and the Mermaid. Though when Dez really finds out that he was hired for being Austin's friend and not his talent, Trish, Austin, and Ally help get him his big break on being the director. This includes making Spike watch some of his films and having Trish become Brandy's new manager. However, Trish at one point loses her temper with Brandy after more of her whining, but she does eventually apologize to her. After Spike shows up after a day of filming, Trish as well as the others say that they are proud of Dez on being a great director for the movie.