thanks for using health care magic.
Your daughter most probably has an imperforate hymen
which is normal given her age. The hymen is a membrane that covers the vaginal opening and it develops while the child is still inside the womb. In small children, it can appear as a thick and elastic membrane becoming thinner at puberty
. It is also possible to have a hymen that is partially open. Later in life it can become perforated after repeated exercises or penetration. However, if by puberty it is not perforated it will have to be incised by a Doctor.
It is also possible to be due to a congenital malformation, however this is rare. This can be ruled out by getting the child examined by a doctor. But then, there is no need to be worried.
Best regards and hope this helps you.