hello and welcome to HCM forum,
i would be glad to answer your query,
I would like you to know that the soft tissue
flap that is covering your daughters tooth is because her permanent molars below the gum tissue flap are about to erupt, once they erupt completely,the flap and the swelling associated with it will disappear.
If the tooth is hurting too much then i will advise you to take her to a dentist
but if not, then warm saline rinses(3-4 times/day) will help relief the symptoms temporarily.
i hope i answered your query,
i wish you good health.