Thornton made her acting debut on Television with a show named Quintuplets. Soon she received several offers and was seen in many TV shows like American Dreams, That’s so Raven etc. to mention a few. She got her first break in the movie with Disney Channel Original Series in a movie named ‘Sonny with a Chance’ in the year 2009 where she played the role of Tawni Hart. Her work in the series was well acclaimed and appreciated. The series ended up in the early 2011 and was replaced by So Random. Her character in the movie remained the same till it came to an end in the year 2012.
By the year 2015, Thornton became a radio personality in Hot Springs, Arkansas for a radio channel KLAZ 105.9. Thornton co-host the morning show named “Kramer and Tiffany”. She also hosts her own mid-day show. Apart from this Thornton also writes a blog for website DisneyBaby.com. She likes to try her hands in different domains and has been appreciated for her work.