She played the first female assistant, Josie, on Beakman's World. She also wrote and performed a one-woman show.
Ubach stars with Lisa Edelstein as a regular cast member on Bravo's first-ever scripted series, Girlfriends' Guide to Divorce. Ubach portrays Jo, who moves to Los Angeles to reinvent herself in the guest house of her just-divorced best friend from college, Abby. "Jo ditches the vegan bakery she owned in New York for a sugary one in LA, she's an outspoken New Yorker who rarely chooses her words wisely in public," explains Ubach. "Jo can be tough or tender, depending on what she has just ingested as food or drink—or if she's fueled by her inner strength, anger or grit." Ubach describes the show as "fun and stylish, it's very relatable." The role of Jo was created following the exit of Janeane Garofalo, who played Lyla, a lawyer and one of Abby’s best friends, for several of the show’s earlier episodes.
Alanna has also voiced another Mexican protagonist on Nickelodeon before, Manny Rivera from El Tigre.