Kristina Grim turned professional in 2005. As a youth player, she played for PBV Atlantis in Bruckmühl and 1. Billardverein in Rosenheim. After progressing from the youth to adult classes, Grim joined PBC Dreieich Sprendlingen in Frankfurt. At the German Pool Championships in 2013 Grim won her first national championship in 8-Ball. In the final she defeated Ina Kaplan 7–3. The following year, Grim won the Grand Prix event in 8-ball. In 2015 Grim took first place in the rankings for the German Tour.
