MIL issues

So basically since having our LO my MIL has been overbearing and let’s just say has crossed the line & been extremely nasty to the point I can no longer make an effort with her. (She’s never really had a relationship with me or her son, but is forcing one now our LO is here despite her “not wanting to be a gran” and lots of other nasty things she’s said including talking ill of my dead mother who she doesn’t know or met as she passed when I was 15). Anyway.. We still let her come over once a week to visit which is more to please her than me and my partner. Last week we had to ask her to leave as it was bedtime we still hadn’t had dinner and she was sitting scrolling on her phone not even talking to us. When her son asked she basically ignored so I repeated the question very politely around 30 mins later and she left in a huff and didn’t say bye to me or our LO. This week she has text my partner begging him and our LO to go to her house this week for the visit and I’m not invited. I am beyond angry. Our LO is EBF and refuses a bottle just now (which she knows) so it’s not really possible for me to be away from her for long periods. My partner of course has told her no and the reasons why (it will be late, there’s no cot or bed for her to sleep at MILs house and she needs to be fed and has a routine etc). I feel like this is the final straw for me with my relationship with her. Am I overreacting?