Kwadwo's first international medals came at the 2009 European Athletics Junior Championships, where she won gold medals in both the 100 m individual and relay events. She defended her junior titles and made progress in the senior ranks at the German Athletics Championships, coming fifth in the 60 m and sixth in the 100 m. She ended the year with bests of 7.38 and 11.38 seconds. In her first year of full senior competition, she won the German title in the 60 m with a best of 7.29 seconds and went to compete at the 2010 IAAF World Indoor Championships, where she reached the semi-final stage. She improved slightly outdoors, running 11.33 seconds for the 100 m and taking third at the German Championships, but had less success at the 2010 European Athletics Championships as she did not get past the heats of either the individual or relay events.