My issue is should I gently put his mom in her place for the final time--and add that with exception of her relationship w/her grandson, please leave my name out of her mouth?? Forever

For those familiar with Jamaican culture, the only son is like God himself. Enters me, "The Girlfirend" , now wife left stage. As far as his family is concerned, I guess their "gravy train" was drying up and they feel/have always felt threatened by my presence. Every time I turn around they had a "tude" with me for whatever reason and walked around with their nose turned up, like I owe them something and I must bend over backwards to please them. The MIL has :
- told me me she had to"PRAY" over a thanksgiving invite to dinner from my family (last time I checked you 300+ frame looks like you never missed a meal, so what is there to pray over other than saying Grace)??
- canceled the morning of my pay-per-head Baby shower when I was pregnant with her grandson
-Declined to attend her grandson's Christening (WTF) . Mind you she was church secretary at the time so she knew all the details months in advance. Told me she had a choir event
- made the excuse that she had school when we first told her about the wedding Plans - AGAIN WTF??!!
- does not drive but finds her way to any church event in America, however, can't find her way 40 miles south to see her grandson. And is giving the impression that I don’t bring my son to see her.
So she wondered why I NEVER included in her in one IOTA of my wedding plans. We even paid for her broke ass to come to the wedding. That was where I drew the line because if they had their way they would have wanted us to pay for the sister and her son to come. These are all grown ass people!!! And it does not matter what the event is, they never have the funds..unless it’s a church event.
I know there are two sides but cmon already, I cannot honestly think of one thing I have ever done to these folks for them to dislike me. Everyone else seems to have gotten the memo that between studies, working mom with a demanding career -50 hours per week, having a small child (that is also sickly), cooking, cleaning, educating, being a sister, wife, friend, daughter, etc..etc--my PLATE IS FULL!!! So how dare she act like I keep her from seeing her grandson or husband?? Or that I have the time to suck up to them?? PUHLEEZE!!!
I know I may sound fed up and I am. I raised this in counseling once already and I will have to revisit this again. Cause as I always say, the person whose family is always starting shit needs to handle it and this crap I can see will continue forever with these trifling folk. Thanks for hanging in there if you have to read this OVERLY long rant!