Nope, you aren’t wrong. I’d be pissed. I’d then say fine, let her do it. I’d then stay home and have the sort of thanksgiving I want.
In fact we stopped going to my brothers because his girlfriend made us feel so unwelcome. She has her whole family too,and we get seated by family. It’s weird, strange, and I prefer to just skip the stress completely.
Last year we put up the tree, had simple appetizers and a simple dinner. It was amazing to delete all the stress.
Let her do it and have a PJ day. Watch a family movie, be thankful for the simple things. I’m doesn’t have to be o hard.