Nighttime potty

My girl will be 3 in July and she’s 100% potty trained aside from naps and bedtime. I’m fairly certain her school keeps her in undies during nap time which we’ve just recently started doing at home too. Not every time, but a lot of the times she wakes up from her nap dry. I read a bunch of things regarding nighttime training and I read that once they’re potty trained during the day it’s best to just completely take the pull ups away?? We kept her in undies last night and of course she was soaked by this morning when she woke up. I guess my question is should we continue undies at night? Or is she still too young? Keep her in pull ups for nighttime longer? Idk what to do. Obviously I expect accidents in the night but I feel so bad she’s sleeping in a wet bed with wet clothes for who knows how long. Advice needed please!