In college, Thornton played for the University of Texas at El Paso.

She spent six seasons in Dallas before being traded on January 16, 2023 to the New York Liberty in a three-team deal.

[3][4][5] On December 6, 2024, Thornton was selected as the Golden State Valkyries' pick from the New York Liberty's 2024 roster in the WNBA's expansion draft.

[6] Thornton is known for her defensive play, and her ability to guard players in any position.

[3][7] In the WNBA offseason, Thornton has played in Australia, Egypt, Israel, Italy, Puerto Rico, Russia and South Korea.