To hate overnight guests

[Introvertpants]

Just had dh sister invite herself to stay the night Xmas eve through to boxing day.
I'm working up to Xmas eve and was so looking forward to an invite Xmas eve and Xmas morning with dh and ds.
His dsis does have options to stay over at her parents but says she doesn't want to because they smoke and she's suddenly against the smoking.
She's coming to us for dinner with other family members but I've put my foot down and said no this is my Xmas too and I want some quiet time with dh and ds as I'm back to work on boxing day so don't have a lot of time to myself.
I now feel guilty and look like a nasty cow cause I've said actually we just want some quiet family time instead of having overnight guests. Aibu

We compromised and said she could stay Xmas night but not Xmas eve. I think I'm just one of these people who like my own space and time to myself. Would love to be more of an open door type but it's not for me.
If it was up to me I would have Xmas night the same as Xmas eve but I'm doing it because it's family. My parents are much the same, they piss off not long after Xmas dinner which I'm fine with because I get into my pjs and enjoy the peace.
I don't like having people staying over it makes me anxious and stressed.

Take up smoking? 😅

This is why I don't have a spare room. The only person who stays over here is my best friend who is happily sit with farting and burping and stuffing my face. She is happy to sleep on a blow up bed on my lounge floor though!