My mom is literally going nuts over my childfree decision and her friends are egging it on

I am my mother’s only child and I’ve known I don’t want to be a mom. I’ve always known this. However, I never told my mother this. I expected her to be upset so I waited until I was in my late 20’s. Well, a month ago I told her and she’s been upset. I expected that. What I didn’t expect was her getting worse and worse. I’ve gone from her being upset to her telling me how devastated she is and how she’s lost the hope of grandkids and a daughter to pass her things to. She also went on a whole rant about how it’s devastating to think I’ll never experience motherhood and she has no one to leave her heirlooms to. I have explained my reasons but she won’t listen. I don’t know what else to do. She’s also gone to her friends and some of our family and they are all pressuring her to make me reconsider. They are all telling her to cut me off and not speak to me until I tell her I’ll have kids. This whole situation is escalating so fast and I don’t know what to do. What can I say to her? How do I get her to stop?