My sister did this. My parent would go in and find her buck naked butt in the air asleep. First, take picture sometime. You can use it for blackmail later during trying times. :) It doesn't have to be an unclean pic. If you take it from the side you can see any private parts.
My mom always told us how they would at least get a diaper on her without disturbing her. Pretty much just pushed in b/t her legs and so in case she peed again. And just then just put a blanket over her. As if she did wake again, she'd just it again.. Overall, that phase didn't last much longer than 1 or 2 months. My sister would actually strip the entire bed and throw them one the floor.
It's summer now, so she could literally sleep naked and be fine. If you don't make a huge fuss over it, she'll get over whatever thing she's working on and move on.