Huddy, I'm sorry you didn't get the best sleep ((((hugs)))))
I would say for today - don't focus on the longer term. You don't have to make any decisions about the longer term and the only early thing to think about is Christmas.
If you don't feel what she suggests is fair, I would go back to her on that basis and seek to renegotiate - accepting that you both may need to compromise here.
Don't worry about why she wants to make that trip. She does and that's up to her. What's up to you is how the two of you agree to split time with the kids this Christmas..
So, try not to widen this and just stick to the short term issue at hand - Xmas plans...all the other stuff - are you done - her stuff - you can think about in the new year.
Hope your day improves my friend and rather than take it out on colleagues, might you share what has happened with someone you trust? I'm sure people would want to support if they know what is happening.
Xx
T 13 M 7 Me 48 H 46 SS 15 BD 7.14 PA D final 5.16 (H filed)
We receive & we lose, and must try to achieve gratitude & embrace with whole hearts whatever of life that remains after the losses - Dubus