It would be better to hang with her... She is like a dog, if u give her Еда she will come for more. But is one cool otaku-anime girl... I would probably be lazy as her and went hunting for homeworks! xD
To be honest, I really wouldn't want to do it. She has to be responsible ya know. If she can pass her exams, she can do a simple homework. I would try to teach her the lesson (that is, if I do know the lesson!) But she'll have to answer the quetions by herself.