Child dealing with period on residential - Recommendations please!

[Peggy0907]

DD is 10 and is more than likely going to be on her period during her school residential. She's going for 4 nights. She already uses period knickers so I will make sure to send her with enough to get her through the whole time she's there. I'm looking for recommendations for a way for her to store the used knickers discreetly. Also looking for period swimwear, preferably bikini bottoms that she can wear under her usual costume.
Anything else I need to think about? School will administer pain relief if she needs it.

I got these for my DD- she finds them comfortable but she's not used them on a heavy day . Period Swimwear - Black Menstrual... https://www.amazon.co.uk/dp/B09D2WZGMT?ref=ppxpoppmobappshare

We did this for DD when she had her year 6 residential when she was 11. She was away for 4 days when she was due and lots of water sports and sharing a room, just seemed unfair especially as she was the only one in her friend group who had started her periods.
Tablets worked fine, I warned her she'd have a heavier period when she got back and more cramps, which she did but it was worth it.