M.F.
My son is 11 and has the same problem. I'll look into the Dry sleeper beeper to see how it goes. I also have a 5 yr old daughter who's never experienced any bedwetting problems. She wakes up alone and goes. If this has changed for your daughter look into her everyday rutine to see if anything has changed. Is she more tired. Is she having difficulty at school or with a playmate. All these might have something to do with it. ALso you may try asking her why she thinks its happening.
I wish you luck and don't worry too much its just be a stage. Keep your patience with her as you do with your son.