You will do what is best for you but in my opinion with your current sitch I would pick:
2. Tell her I want to talk about this only in front of a mediator.
This is really the only safe option you have since she is bent on making you out to be a horribly abusive person.
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She offered the other week to me, and if I don't use it, she wants that also
Take the week with your children and use that time to form healthy attachments and new memories. If you don't she may use that against you later on. I hope she wouldn't but it is better to be cautious. Journal what you are doing with your children and all the positive interactions. It will be a great way to look back at the positive during a difficult time and can be used in a custody hearing if you divorce.
1st BD December 26, 2008 PA admitted to by XW December 29, 2008
2nd BD May 23, 2019 Daughter confirms EA Divorce Finalized July 18, 2019