I don't think this has anything to do with your age difference. I'm prone to being involved with men a decade older than myself and there's nothing uncommon about that.

That said. Her behavior is way out of line and completely inappropriate. Those are not conversations for a daughter to have with a father or for even that matter a mother.

Is she in counseling? What's been going on in her homelife with her father being absent? Why did her mother cease contact with him? Why was he out of their lives for so very long?