G.B.
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She can't potty train during the night time hours, there is no such thing. Either her brain turns of urine production when she falls asleep or it doesn't. If it hasn't yet then anything you do is only useless work. Waking her up only makes her clench her vaginal muscles and hold her urine. As soon as she goes back to sleep she'll flood everything.
If you want her to sleep in pee pee sheets then don't let her wear a pull up. If you don't mind all that extra cost added to your laundry then doing sheets, blankets, pillows, etc....every day won't be a bad thing.
For me? I prefer not doing useless loads of laundry every day. I have things to do that are not stripping beds all the time. My time is worth something too. Plus the additional cost of the laundry is more than the box of pull-ups would be.