She played with the Boston Blades under the direction of head coach Digit Murphy and was used as a defensive forward.

[3] On 11 July 2018, Mrázová returned to professional hockey and signed a contract with the Connecticut Whale of the NWHL.

[5] She played one year in the NWHL before returning to Europe to sign with Brynäs IF Dam of the Swedish Women's Hockey League (SDHL).

[9] She represented Czechia at three IIHF U18 Women’s World Championships, being named an assistant captain in the 2010 tournament where the country finished in seventh.

Although the Czechs lost to Sweden in the relegation round, Mrázová accumulated 2 points on two assists during the tournament.