I know it doesn't *feel* like it, but "Good morning" and "Have a good day" are basic civilities. From here it looks like she's simply pretty detached, while common civilities are painful for you. This kind of reactivity is normal, and it is a good reason to go dark for awhile as you seem to plan to do.
It might be helpful for you to be clear about this with XW:
"XW, texts and calls don't work for me unless there is an emergency. So, let's stick to email for regular co-parenting business. The holiday schedule looks good, thanks."
