You don't say how old your DD is, but DSD suffered terribly after starting at 10.
Headaches, horrible cramps, backache etc, paracetamol helped along with hot water bottles but that only helped in the home environment.
She'd started just before the summer holidays so it was sort of manageable to begin with at home, but once back at school it quickly got to the point she was missing class a few days every month - it was awful to see how miserable it made her :-(
She struggled at school wrt embarrassment and facilities (and the fact non of her friends had started yet so it was quite alienating for her).
Upshot is after a chat with the GP DH and her DM agreed for her to go on the pill.
As per pp's it made a huge difference and equally it (at the time) was described as medicine for period pain (obviously it was explained properly as she got older).
I'd definitely see your GP and don't be put off if they talk about the pill as an option. It made a huge difference to DSD, not just physically but emotionally as well.