[richardthered]

Firstly, I don't see how she has any legal obligation to pay for the medical care, at all. Your friend didn't get the medical care, her father did. Unless the father is a legal dependent of your friend, she isn't responsible for his medical expenses, at all.

Secondly, it sounds like you are making assumptions about her overall financial status, based on what you know about her current salary.

She might have substantial student debt, medical debt, spousal debt, be upside-down on a mortgage, have other family that she is supporting financially, etc.

Just knowing someone's salary doesn't provide a very clear picture of their overall financial status.