Nope, I dont think that she has totally let go. And I absolutely understand about her getting to benefit from being M to you and still doing what she is doing.
Ugh. I hate that she is asking you to do these things and still running around like a single woman. I agree with BeingMe, and the more you detach from her wierdness, the less it will affect you, hopefully!
I guess I gave the wrong finger to the wrong man...