I understand the whole problem as I've been there with my daughter . We finally did get her the pill. Helped a lot but then she too got ill from it the patch has been the God sent. Even now as a married woman she uses it.It has to be the best thing ever invented.
If you have taught her the values you beleive in and keep reinforcing them she should do the right choices. As others have said after a year if they haven't this won't change that. Trust her to be smart.