T.B.
I have 4-year-old twins. One usually stays dry and the other usually wets overnight and even at naptime sometimes. My husband was concerned; although, I was not too worried. My daughter was a heavy sleeper and although she didn't consistently wet the bed, she did have accidents on occasion until she was at least 7 or so. She now wakes up to go to the bathroom, but often is disoriented because she is not fully awake. We sometimes have to direct her to the bathroom. I agree with the other posts--don't worry and move her to the next size pull up or goodnight. They also make waterproof mattress pads if you want to give it a shot without. Just be prepared to do laundry in the morning. :)
T.