Irish, I'm sorry that it's come to this and also sorry that your daughters were there when you were served. Her empathy chip is completely shattered and gave no thought to how this would affect her daughters.
I'm glad that everything that was discussed in mediation is in the papers. Definitely correct, i.e., add in, those items that which are owed to you and/or your daughters. As to her claiming the money that was put in D15's college account...it's not hers. She would have only gotten it if something happened to your D...she nuts if she thought she would get that money and I'm glad you changed the beneficiary. She can't touch it and believe me, she would have taken it all and run w/it.
She really is a lost one and it's going to take a long time for her to recover, if ever.
Continue as you have been doing. I think you've been doing great and you are a great support to your daughters.
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.