The short answer is that all kids are different & bed wetting at this age is still pretty common. Nevertheless, I would let her pediatrician know what is happening so they can do a thorough exam in order to make sure what she is experiencing doesn’t indicate anything serious. Good luck!
My 3 year old still has accidents at night also. I think this is normal, but the problem we face is that the pull ups always leak! It drives me crazy! We’ve changed sizes, taken her potty right before putting her down, but it never fails…she wakes up at least 2/3 times a weak laying in pee. 🙁