LOLIPOP CHAINSAW lol! Get games that are based on children's movies, there's so many of those.
Depends what she likes. My 8 year old little sister is fine playing call of duty and warhawk with me, and even plays fallout and skyrim, but my 11 year old boy cousin is completely grossed out by violence and blood. Flower is good, also you should let her play playstation home. Its kind of like club penguin. My little sister loves the muimuis too.