She is an eleven-time German national champion and is the second female player (after Franziska Stark) to win three of four disciplines in one event at the championships.

In 2010, Kaplan reached the final of the European Pool Championships in ten-ball, finishing as runner-up behind Jasmin Ouschan.

Kaplan is third on the all-time list of winners in the tour, behind Ouschan and Kristina Tkach with a total of 12 medals from the events.

[2][3] In 2009, Kaplan won her first national championship with victories against Kim Witzel and Simone Künzl in eight-ball and nine-ball, respectively.

[6] In 2012, Kaplan reached her first final in the Women's Euro Tour, finishing as runner-up at the 2012 Treviso Open in Guimarães.

[8] In November 2013, Kaplan played at the 2013 WPA Women's World Ten-ball Championship, reaching the round of 32.

[17] In the 2014 Team World Championship, Kaplan represented Germany alongside Thorsten Hohmann, Ralf Souquet, and Sebastian Staab.

[22] As of 2019[update], Kaplan is third on the all-time list of winners on the tour, behind Jasmin Ouschan and Kristina Tkach.

In 2014, Kaplan organized the Autohaus Keller Cup, an eight-women tournament played inside the City-Galerie mall in Siegen.