[1] Krappen made her World Championship debut in 2003, losing in the quarter-finals to Francis Hoenselaar.
She went one step further in 2004, beating Anne Kirk in the quarter-finals but lost in the semis to Trina Gulliver.
She then suffered quarter final exits the next three years, losing in 2005 again to Hoenselaar, 2006 to Jan Robbins and 2007 to Apylee Jones.
She reached the semi-finals in 2008, defeating Rilana Erades in the quarter-finals but lost to Gulliver once more.
[2] She reached the final of the Women's World Masters in 2006, beating Julie Gore, Clare Bywaters and Carla Molema before losing once more to Hoenselaar.