It is hard to know exactly what is going on in this situation, but I get the impression from what you said that your friend is competent, and knows what's going on with her finances, but she's in a vulnerable situation and it sounds like she may be, at the very least, suggestible.

I hope that the younger brother can be trusted with her care, and that she will get good care at the hospital near him... unlike the care she got at the hospital you visited her at

Would you feel comfortable asking her any kind of questions about her brothers? I know that you probably wouldn't be, but I thought I would ask anyway.

I'm sorry that you have so many worries about this situation. It sounds like based on history, you have a right to them (((HUGS)))