I don't post much, but I relate to this really well.

I was in the same situation as your daughter for a long time, and it took a while for my parents to realize that I did not see the pill as a free pass for sex, but as something that I needed so that my life was not interupted for several days, every month.

If your daughter is really level-headed and has common sense, and as long as you can talk to her about your concerns openly, please get her a prescription as soon as you can. She will thank you 10 fold, and one way she will do that is by not disappointing you