Boundaries


I am trying to put some boundaries to my mother but each time I do it it makes some drama because she doesn’t accept it and tries to convince me that I’m a jerk. How can I do it better ? Writing her a letter? Talking and having a conversation isn’t working at all. And when I send her messages she said she doesn’t understand… I’m really confused about that relation. She is my mother but if she wasn’t I would stop the relationship because it’s too complicated to communicate with someone who doesn’t want too…Thanks for your help !