Ask her teacher if the students get assignment books or agendas, also make sure she has a homework folder to put homework into, that will keep her organized and you'll be glad that the problems over
I agree with TVo's advice. It is possible that she doesn't always know what she is supposed to do for homework. You might want to ask the teacher to check her assignment book to make sure she has correctly written down what she is supposed to do. Then you could help her check off what she has finished, and make sure she puts it in the right folder.