Geng began skating at the age in 1998. Her international debut came at the 2008 World Junior Championships in Sofia, Bulgaria. Ranked 24th in the short program, she qualified for the free skate (17th) and finished 21st overall. The following season, she made her first and only appearance on the International Skating Union Junior Grand Prix series, placing 8th in Mexico. At the 2008 World Junior Championships, she placed 11th in the short, 21st in the free, and 18th overall.