If a flap of skin at the entrance to the vagina
was torn but not entirely, it might heal. But a doctor would not say it "grew back," he would say the laceration healed, or something like that. The whole story sounds a bit odd -- a friend "was told" her daughter was "molested," does that mean rape, and the vagina, or does it mean groping inappropriately, or does it mean anal penetration? Someone can truly get molested and still not have the hymen be involved.