She is most known for playing Carmen Cortez in the Spy Kids series, but she has been in other movies since then. She was the main character in Sleepover. Alexa was also in Remember the Daze, Repo! The Genetic Opera, Innocent, Broken Hill, Mother's Day, Cafe, and From Prada to Nada.
Additionally, she was a main character in Ruby & The Rockits, and has guest appeared on nine episodes of Ladies Man, seven episodes on To Have & to Hold, six episodes of Evening Shade, and episodes of ER, Chicago Hope, The Magnificent Seve, All That, Ghost Whisperer, and The Middle.