She lastly played for the Los Angeles Sparks of the Women's National Basketball Association (WNBA).

Thomas was selected as a member of the USA Women's U19 team which won the gold medal at the FIBA U19 World Championship in Bratislava, Slovakia.

[2] Prior to her rookie season she was traded to the Washington Mystics on April 29, 2011 in a three-team trade deal; with the Indiana Fever receiving Erin Phillips and the Storm's third round draft pick, and the Storm receiving Katie Smith, Jacinta Monroe and the Fever's second round pick.

In the 2016 season, she continued her role as the Sun's starting point guard; she achieved new career-highs in scoring, assists and field goal shooting.

[8] Thomas would finish the season setting new career-highs in both field goal shooting and three-point shooting percentage as well as in scoring and steals as the Sun finished fourth place in the league with a 21–13 record, receiving a bye to the second round, making it their first playoff appearance since 2012.

[16] By the end of the season, the Sun were a championship contender in the league, finished with a 23–11 record and the number 2 seed, receiving a double-bye to the semi-finals.

In the semi-finals, the Sun defeated the Los Angeles Sparks in a three-game sweep, advancing to the WNBA Finals for the first time since 2005.

[19] On Jan. 19, 2024, the Dallas Wings announced their hiring of Thomas as the organization’s Director of Player Programs and Development Coach.