TM, I'm sorry. There will be no 2x4's coming from me. You've done everything you can. Step back, detach even more and yes, you can be cordial to her, but that doesn't mean you have to be there to rescue her every time she needs something.
Continue moving forward.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.