Hey, suzvin20, and welcome to Psych Central! I can see where you would be concerned about her. My opinion, though, is that she would be very angry if anyone tried to intervene. And we aren't able to diagnose here, since we aren't experts.

I don't know if she is mentally ill. She sounds like she has some behaviors that are unhealthy and not "normal," but I only know what you are telling me. Too bad she won't even go to a regular doctor. Then she could get some official diagnoses as far as physical health and maybe even be encouraged to get some mental-health therapy, if needed.

I don't know, but she might even be having some depression. That can cause some of her symptoms.

Have you tried just trying to express your concern to her about her physical health? Asking her if you can help? (A more low key approach.......) Of course, even that might make her mad.

You might be right that her current boyfriend might finally get fed up enough with her to leave. Maybe that would be a bit of an eye-opener for her, though.

I hope some other folks will offer their comments, too. I am just not sure what the answer is.

I assume she was once married to your brother?