On one hand, it's good that he now have such a strong incentive to fight his demons and improve his life.
On the other hand...
I couldn't bear it.
Every time she relives a trauma and survive and find him there, she'll cling to him harder, idolize him more, become more emotionally dependent. Having someone to trust is good, but in a situation like that, imagine having someone depending on your existence to have the will to stay alive.
And man...
You know how for a depressed person words of encouragement can have the opposite effect? Because the person encouraging can't imagine how the other person actually feels and reacts emotionally? Is this but absurd levels of intensity. Her mother is just the worst, she cares for her daughter in the worst way possible, she wants her daughter just to be invisible, not cause problems to others, not to protect her and her well-being.
It's just so sad...