Wow! Thanks for that reply, CS. Something about your comment, "She is having an A and you still want to be there for her? Make the A easier on her?"....really drove it home for me at last. Sometimes it truly is harder to see the forest for the trees...
My biggest focus during this time has been striking a balance between being "there" for her and doing what's right for myself alone. Both you and Gritter have very graciously and wisely let me know that there is a way of finding a healthy, loving place in the middle. Which is what I want to start doing. It's okay to set some firm boundaries, but there's no reason to be a jerk about it, either.