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I went no contact during the holidays. It was taken as fighting words. But my family interactions were different. I believe what I tried, was "I'm not celebrating the holidays this year" and that was taken as a declaration of war. And it didn't let up and escalated. So, I finally had to state that I wasn't going to contact them. It was ugly but worth it in the end.
It sounds like you have a solid plan. Take care of yourself and do what's right for you.
I think that you and your mom are making the right decision. Since you already did not see them last Christmas, I think it would be a step in the wrong direction to see them this one. You already did the making excuses once and now hopefully you'll be able to make it a habit and tradition this year.