I think she is focusing on helping Baron start his life as an adult, going to college in a few weeks and staying safe. She has already said she will not be living in the WH if Trump wins. She will divide her time between NYC and MarALago. She will attend State dinners etc., but her focus is Baron who will attend NYU.
This helping Barron excuse is wearing thin -- she needs a better one. At 18 many join the military--- without mommy --- and even more are setting up hot plates in their dorm rooms --- again without mommy.
I'm guessing Barron wanted to be in Wisconsin with his brothers, Tiffany AND his dad.