She, most likely, does have good intentions. It's not her intentions I am concerned about, but, mostly, her judgment.

To be fair to her, she is dealing with a challenging situation here. If you were a kid, it'd be easier because then she'd be required to report your father to the police and the CPS. But you are not a kid. So, she can't report what's happening. She can only work with you on finding ways for you to protect yourself without complicating the situation further given that you don't live independently. But talking to your family is a very bad idea IMO.

I don't know if she ever asked you if your father has any access to children. She should've asked, and if he does happen to be around children, that would allow her to report him to CPS.