if shes only just starting to sleep through, id leave her in a pull up for longer jic..
with DD1 we left her in a pull up for 2 weeks after she night trained, shes wet the bed a few times.. other wise grab your self one of those special sheet tp put on the bed, that way if she wets you just remove that and not have to change the whole bed

ETA when DD was night trained but still in pull ups we reused them a few times