Tell her to think all the hardships of her mother. Her mother keeps on doing her best for her why the mother keeps on doing that? Simple because she believes in her. She's her hope. And tell her realize her worth. I'm not in position but hehe it's sad. I'm sad for the sister and the mother. They don't deserve it. Your friend don't deserve how she is treated. And yeah thank you for not leaving her, for being a true friend to her. She's very lucky to have you 😍 if she didn't listen, you've done your best.