You're a good friend, pugs.

If living with her family is what's making her depressed, then you have to expect she will have bouts like this on a recurring basis. It doesn't sound like she has enough self-reliance to get into a independent living situation. So she will keep getting unhappy. Depression often comes from feeling you have a problem that you don't believe you can do anything about.

Take care of yourself. That's your main responsibility.