Does the teacher think you're pushing your child too hard? Perhaps she's asking for ideas from your DD as a way to prove the desire for enrichment is coming from you and not your child?

If I was in this situation, I would do as suggested above and compile a list of topics WITH my child. After submitting the list for approval, I'd send in materials for these independent studies. It's not fair & it's not your job. It's definitely the teacher's job... BUT the teacher has already made it clear that she is not interested in providing enrichment. Even if she does finally give in, do you think she'll plan QUALITY enrichment? This might be the only way to salvage the next semester for your DD.