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.
In the Women's Euro Tour, Kaplan won events in 2013, 2014, and 2017 and finished three times as a runner-up.
As of 2019, 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.
Kaplan also promotes pool events, usually women's events.
She is married to fellow German pool player Jörn Kaplan.
They share a professional pool club, where she was the first woman to play in the highest tier of German club pool, the 1st Bundesliga.