Hello, This is a very common situation for newly erruptd teeth to experience a flap of tissue while in the early stages of eruption. Rinse the area vigorously and try to keep it clean. Take a soft toothbrush and massage the tissue. This increases blood circulation and firmness. Try to be careful to not let food get caught under the tissue. She may have bitten the gum area and caused slight trauma, but do not worry. As long as the tooth has enough room to errupt, this will resolve. Only if there is swelling with increased pain, would you need a dentsit to assist by cleaning out the tissue and prescribing antibiotics. For slight soreness, take some anti-inflammatory medication such as ibuprofen or acetaminophen. There are gels with benzocaine available to apply to sore tissue as well. Thank you for your inquiry. I hope the area improve with my suggestions and will appear better soon.