I can see Eugenia wanting to take care of her teeth as a cosmetic thing. I doubt she cares about the health of them.
They can drive her to the doctor but they can't force her to see one. I know people like to pretend she's a teenager but she's an almost 30 year old woman. She probably has her own health insurance too (or pays out of pocket) as she's too old to be on her dad's. If she wants to starve herself to death, it's her right. We're all just watching the trainwreck.
She's almost 30. If she doesn't want help, no one can force her. She'd just end up with another involuntary hold and be out in no time like last time, if anything.