Hi M.,
My advice would be to try your best to keep doing what your doing and "try" not to get frustrated. My experience with my son, now 9, is that sometimes the night time thing needs time for many different reasons. My pediatritian said that the reason my 7 yr old was still wetting occasionally at night was possibly due to a small bladder, or a chemical from the pituitary gland, not sure if it was HDL, may not be developed properly yet and this can happen. My neighbor experienced the same issue with her daughter at 8 yrs old - she would occasionally have an accident at night. It's a common issue that isn't talked about and since your daughter is only 4, just keep helping her but try not to get frustrated if it doesn't happen right away. And, check with your dr to see what they have to offer. Good luck, M.