Cox began her career at the age of four, when she appeared as a dancer in several ballet productions and TV specials.

[citation needed] She began acting at the age of ten, making appearances in several movies and guest-starring on shows such as Baywatch, Star Trek: The Next Generation, Mama's Family, Eerie, Indiana, and Blossom.

Her appearances on various TV shows led to her first prime-time role as Tiffany Malloy on the sitcom Unhappily Ever After, which ran on The WB from 1995 to 1999 for a total of five seasons.

The most successful show Cox co-starred in following her time on Unhappily Ever After was on the NBC TV drama Las Vegas from 2003 to 2007 for a total of four seasons.

That same year, she also appeared in Lonely Street, a comedy, starring Robert Patrick, Jay Mohr, Ernie Hudson, and Lindsay Price.