She portrayed the role of Nicole Bristow in the series of Nickelodeon the Zoey 101. They co-starred in the program along side Jamie Lynn Spears and Kristin Herrera who were in the first season, as well as Victoria Justice, who came in to the picture in the second season. They was involved in constant off-screen fights with Jamie Lynn Spears. Jamie Lynn's brother Britney Spears became involved as well, and finally Nikolas was written off the show (it is actually unknown what the fight was about). They appeared on Hidden Hills regularly and also on the 2005 mini- series RevelationsShe also guest-starred in several more shows, most notably The Suite Life of Zack and Cody, Judging Amy, andHeroes.
They appeared in a supporting role alongside Vanessa Hudgens in the latter's music video, "Come Back to Me".Nikolas at two times had supporting roles in the films Motocross Kidsand Tiptoes. A year later they was offered a role on the Disney Channel where they could star as Alex Russo in the sitcom Wizards of Waverly Place. Nikolas didn't get the offer, which was later given to Selena Gomez. In 2009, they appeared in the remake of Children of the Corn. They is set to appear in the upcoming film LOL (Laughing Out Loud) a remake of the Italian comedy, opposite Miley Cyrus and Demi Moore.Recently, Alexa played the role of Amanda Dunbar, a character that appeared in Season 3, Episode 9 of Deceive Me.