How do I talk to my mom about this?

I don’t even know what you could call her behavior but my mom is crazy. Maybe I’m crazy for thinking this but 🤷🏽‍♀️

If I don’t talk or see her for a few days she will text me this long message about how I don’t care about them(my mom and brothers) and how I’m keeping her granddaughter away from her ect. I have my own life. I have a house a car a job a baby and pets to take care of I don’t need to talk or see my mom ever day. She also talks bad about my grandparents (her parents) how they are terrible grandparents and how they don’t see their grandkids or act like”normal” grandparents and how they suck. She will literally put it in my grandparents head that they hate them. Both my grandparents still work, my grandpa has a full time job and my grandma a part time job.

How should I talk to my mom about this? Am I crazy or? Oh the crazy part is is that she will act like absolutely nothing is wrong 🤯