marle,
It's good news in itself that she is even talking about doing this. Whether she follows through or not she is one step closer to finding help and a better life. Getting tired of her life sounds like some good motivation for change.
I'm happy for you that she's asking for help and also letting you know how she feels.
I think you are wise to have reservations about your own expectations. I call it guarded optimism and good recovery. It would be great if she follows through with this.
:praying