Need to rant or I'm gunna freak

So my MIL and I haven't been on best terms ever sense my husband proposed to me Christmas last year. I was 9 months pregnant at the time and before that we got along great and she was excited for the baby and everything. Well after the wedding I finally had the gumption to tell my husband how I felt like his mom was favoring his sisters kid over mine and our daughters (I have two boys from previous relations that he has taken in whole heartedly and is actually adopting my youngest son) she is always posting pictures of him and is always making it a point to spend time with him and her daughter and the baby live in a different state!!!! well she got pissed and said I was a horrible person for saying that and that I am causing issues in their entire family. I haven't ever caused any problems with any of his family! And how is someone going to tell me that how I'm feeling wrong?!?!? His grandparents love all my kids and welcome me with open arms! His dads side of the family love me and my kids and always wants to spend time with them. Now she is constantly texting him saying 'are you ok I'm worried about you' or 'well as long as you're happy'' and it pisses me off!!!!!!! 😡😡😡😡 like MY husband is happy! HE chose ME to spend his life with! HE chose to be in my life and the my kids! Well now we are doing thanksgiving this year at our house because we finally had a place big enough and we want a special moment with all of the extended family to tell them we are expecting. Again. Well his mom isn't happy about it and has made it pretty obvious that she wants nothing to do with me. This is the text she sent a few days ago!!! He didn't respond and explained to his grandma that we wanted to do thanksgiving and she wasnt upset at all and told us she completely understood.

I have this to say and it's the last time I'll say anything to you about it. Your wife is not a good person to cause turmoil amongst our family and you aren't either if you allow it. I do not play favorites with innocent children and that is an ugly accusation. If you don't want your family to know us, that is your business, I will not force the issue. You are a grown man, do what you think is best and I'll support that even if I'm not part of your life. I love you and all I want is your happiness.

Im just over her and seriously want to text her and tell her to cut the umbilical cord! She wasn't there when her son was lost in life and an alcoholic. I WAS! She wasn't there when her son was sleeping in a broken down trailer behind a friends house with no heat or food! I WAS!!! 😡😡😡😡😡 in just so pissed off.