A good bit of my career was spent investigating these type cases and from reading the above comments a couple of things jumped out to me:
1. Most of these type abusers look and act normal and don't come off as pervs.
2. Unless she has a very compelling motive, such as being prompted to do so in s custody dispute, most children will not make this stuff up. If given a strong motive, they sometimes will, but generally their story will become inconsistent and good investigators will see through it.
3. Either way, this child needs help.