Am I wrong for this? Edit

My mil lives 30 mins from us.We(me,my SO, and our 18 month old) live in a one bed one bath apartment 730 sq ft. Sometimes when she comes over to visit she wants to stay the night. I tell him she doesn't live far away, she can go home. He tells her no and she gets upset and he gets upset that she's never allowed to stay the night and thinks I don't like her. That's not the case. We live in a small apartment. At the end of the day, I wanna be comfortable and walk around my apt with no pants on. I told him,if she lived far or didn't have a place to go or was sick she can stay the night but otherwise I like my space and I don't want anybody idc who staying over. I've made exceptions like when his bro came for a week from out of state. I had no problem with him crashing on the couch. He doesn't live local and he wanted to spend time with his brother. My sister who is homeless had a surgery and she crashed at my house until she recovered and then she left. My niece who is 14 likes to come over and stay the weekend once in a blue moon. She lives 2 cites over. And even when his mom had a surgery I had no issues with her staying until she recovered. So I'm not some jerk that dislikes her. I just feel like with anyone, if you don't have a good reason and you live close by, after a visit, go home.

Edit- Her and I have talked. It's not her that thinks I don't like her(though I have heard her ask him if I'm the boss because he wanted to run something by me.We run things by each other btw) its him that thinks I dont like her.

And the reason she wants to stay the night is because she says she gets lonely(she's divorced and lives by herself) and she wants to spend more time with her family. Idk how much more time your gonna feel like your spending with your son and grandchild when it's night time and everyone's asleep. I understand she gets lonely but when she comes over she stays from morning till 9 10 sometimes 11pm.I don't complain because I get it she's lonely. We invite her out to outings but 9 times out of 10 she doesn't want to go or says she'll go then bails at the very last minute.

Also my SO and his mom can only spend a few hours together before they start arguing with each other so it makes everything uncomfortable.

And we had an issue last yr when we lived 3 hours away after I had my child she came to stay with us for a few weeks. He worked and he'd come home and ask her how she was doing and she'd say fine but she was lonely because I wouldn't pay get attention. I had just had a baby and wasn't trying to entertain anyone. Him and I ended up arguing about it because he basically wanted me to hold her hand and cottle her and I told him no. Long story short I ended up taking my baby and going 2 hours away to stay at my mom's till she left home.