I agree w/bttrfly and Andrew. She may be finally winding down on her crisis, but will that change anything between the two of you? She is married to the OM and you are still hurting from all of the damage that she left behind.
Bottom line, keep the focus on you and your family, especially the new grand child. BTW, he's adorable.
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.