What are some good 9 year old girl costumes for halloween?

The type of costume you chose for your little girl depends on her personality. If she is a girly-girl then it is usually safe to go with sparkly or girly costumes. Princesses, dancers, fairies and things like this are nice. You can change things up to make them unique. If she is more of a tomboy then sports players and monsters are cool. You can even use book characters or take any normal costume, add some fake cuts and bruises, and make her a dead-princess or dead-cheerleader. Just be creative and try to fit it to her personality as well.