Am I being petty ??! Long but plz help

His mom is basically an ex druggie. And it's really obvious by looking at her and talking to her, she in her older 60s and she is seriously the wicked witch of the west. Me and her have ever barely gotten along. Maybe only the first few months I started dating him. I felt as our relationship progressed, she disliked me more or found reasons (made up) to not like me. We've gotten into some altercations with her getting in my face and calling me some really disrespectful names. Also at one point claiming my baby might not be her sons, all bc she was mad that MY LOVING PARENTS were throwing me a shower, without her help. 

I still put that aside, bc I don't hold hate in my hate for anyone. And I still invited her to the shower which was going to be at my parents house. 

She denied the invite. And that argument happened a few days later. 

Since then I basically avoid her as much as possible, since we have our own apartment upstairs. But they're times that she'll come upstairs to ask my BF something or whatever, she'll smile at my stomach or try and be nice. But seriously I've put up with so much of her shit especially since I've been pregnant that I'm surprised I even still live here for one, and for two haven't punched her in her throat. ( I was raised with respect) 

OKAYYY so here's my problem, my parents have thrown me a shower, brought my baby's pack n play- numerous outfits, given me money to buy things while I wasn't working and also is 10000% supportive. It's their 1st grandchild so I get it and this is probably her 10th (who knows) 

After my shower, she didn't even care to see the things the baby got. Nor has she even asked if the baby still needs anything. The one big purchase we still need is the car seat. I'm due in 31 days. A week before Xmas she told me she'll get the car seat by the end of the month. My BF had to ask her to even do that, bc moneys tight right now and we can buy it but it'll be putting us behind on our car note BC we were relying on her to buy it. 

So today 1/1 my BF ask her if she is still getting the car seat and she basically ignored him. Didn't say anything. He even felt like he had to ask her while she was pre occupied. 

NOW IM FEELING SOME TYPE OF WAY. Regardless of if me and her get along, this baby is still apart of her family and the fact that she made a huge deal abt not being involved in planning my shower yet u haven't even purchased not ONE things for my child. And the main thing u promised to get, that is REALLY important- your playing games ? I'm due in fuckin 4 weeks and my BF gets paid next week now we have to find the extra money to get a car seat and I can't ask my parents for anymore help. I REFUSE. they've done enough! My dad even gave us their old 60" flatscreen and a fridge for our apartment FOR FREE . 

Am I wrong for wanting to be selfish when my baby comes ? I don't want this lady around my daughter but I know that's not realistic. But me nor my daughter need fake love! It sucks bc my baby isn't even here yet and she's already being treated differently 😩😤😳 any words of encouragement besides GTFO this house lol 

#EndRant