You can't rationalize with someone who is irrational and bouncing off the walls. That is why we advise not to try to analyze their every move of comment that they make. You can't please them.
Keep the focus on YOU and your children. Leave her to her madness.
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.