you need to keep an eye on her and check thenest every few hours. it is still very possible that she have anotherbaby or 2 in her
did you check to make sure she doesn't have a stuck kit? if not, you need to look at her private parts and check.
you can also try feeling her tummy for babies, although if she just had3 of them, her stomach will be rather lumpy feeling anyway.
if her behaviour doesn't stop by tomorrow morning, i would call a vet.. .you don't want to take chances when it comes to a rabbit havingproblems having babies.