Mother in law

Ok, so I'm currently almost 20 weeks pregnant. Due in may. I found out August 26th I was pregnant.

I had visited my family and friends at the end of July into beggining of August. I tried to plan a dinner with family friends including my mother in law. she had confirmed coming to dinner on the Friday before I left from visiting from colorado. (everyone lives in NH) it turned out too many people wanted to do dinner. so I split it into a few dinners over the course of 3 days. I asked my mother in law and sister in law if they wanted to do dinner with just us. she tells me they are basically to busy to move the day and she wouldnt come on friday.....I said ok then I guess I wont see you while I'm here then.

fast forward to when I tell her I'm pregnant at the end of September, she says to me hmm well I thought you pregnant while you were here visiting and that's why you didnt want me at your family dinner because you wanted to tell them without me there. I got really hurt by this, because what kind of person would do something like that and i tell her this, that she made me feel like an awful person to think I'd do that to her.

she gets upset with me initially tells me good luck with the pregnancy and have a nice life because shes mad I got upset by what she said. then she sends me another message on Facebook playing victim saying shes sorry for making me not like her and she never understood what she did wrong to me and playing pity party. I just dont answer anything at this point. I'm to upset. I then get a physical letter from her, saying she hopes the whole reason why I got upset was because of my pregnancy hormones. which made me more upset. I haven't confronted her further on this because I feel like shes irrational and now everything she does annoys me. I told her please dont buy baby stuff yet, she tells me she went baby shopping and is constantly tagging me in baby nurseries on Facebook or telling me how to sit in my car and what not to eat and to not drink tap water without consulting with my water dept. I mean I know she is just probably excited but I'm not an idiot, I can read and find out things on my own. I dont need to hear overbearing advice right now. it stresses me out.

does anyone else have these issues? I feel crazy