It sounds like there may be arguing at his house. And she's picking it up. I'd ask her if her daddy and someone else were yelling a lot. As for wetting herself. Stress! Poor thing. Whatever happens i hope she's ok.
Are you trying to suggest he's doing something to her?
It does sound like a stress reaction. I had the same issue with my son when he started first grade as it was a big change for him (all day away from me and pressure that he'd not really had before). Extra sleep, extra tlc worked to resolve it once our doctor helped us see that was the issue.
but to me, it seems you are suggesting her father is doing something to her. Is that what you are trying to say?