What does she want to be for Halloween? Is there some way you could help her make all or part of her costume? Many types of Halloween costumes do not have to be fitted all that well and don't have to have perfect hems. I think they can make great beginner projects. Witches or angels can both use skirts that are just gathered on an elastic band. Any type of cape is pretty easy. If Halloween is a possibility for you, you will find 1000's of ideas online.