Dd1 took ages to be dry at night, finally cracked it when dd2 kept waking us early, I would get dd1 up and on potty as she was doing a big wee first thing. She soon got the message and stopped weeing in her nappy.
dd2 was a dream, dry day and night in 48hrs, I took the nappies off at night to avoid the proloonged (year) of night time nappies we had with dd1.
ds has been potty training since begining Easter hols, he's been a bit more up and down, but took night time nappy off after 10 days. He usually wakes us in time, or is dry all night now. He was wet in bed about 1/3 nights, now he is wet sometimes after he gets up, but before he and I meet at the potty, so we have some puddles.
On the bed I have a normal sheet, then waterproof, breathable mat under that, then another sheet and (as we already have them) a disposible changing mat. The top layer can be washed dry and back on bed by nighttime. If she is wet more than once a night you will need an extra layer.
IME children don't seem to volunteer to go without nappies until they are quite old, there are 5yr old children in dd2's class who are still in pull-ups because parents are waiting for the 'signs'. Obviously some children do have problems with either sleeping too deeply or they don't produce enough hormone, but you won't know until you try. Modern nappies are so 'good' that they still feel dry with lots of liquid, so children learn to wee in them at night.
I would give it a go, keep going for a couple of weeks, and see how you go. I find that washing bedding every few days isn't too tricky, and the thought of another 365 nappies spurs me on!