My DD (just turned 7) likes Cooking Mama and Animal Crossing at the moment. When she was younger, she really liked Tinkerbell - she hasn't outgrown it, but played it so much that she wanted something new. Littlest Pet Shop has been mostly outgrown.
She also plays Big Brain Academy and Left Brain / Right Brain (borrowed from her grandmother).
If you have a GameStop near you, they have a 7-day no questions asked return policy on used games. Professor Layton and Scribblenauts both got returned. The used games are also a bit cheaper.
