Period and vomiting in pre teens

My pre teen started her period unfortunately at 10.5 years old, she's a few months shy of turning 12. She gets awful cramps but the kicker is some months she will also throw up. Does anyone have experience with this? Reading up on it, it could be linked to PCOS. My heart breaks for her to go through this at such a young age. She bounces back pretty quickly but no parent wants their child suffering like this.