Said she won’t speak to me for being a sinner

My mom is extremely religious and does not agree with most of my decisions . She was never really there for me growing up due to her being so involved in her church and it took up most of her time. I moved out with my oldest sisters when I turned 16. They raised me and have been my rock always. Ever since then, I haven’t really spoken to my mom unless it’s for a birthday or holiday. I moved out with my boyfriend about a year ago without letting her know. My sisters have always been my support system and they were so excited for me and helped me pick out stuff for my apartment. After I had moved in, I sent my mom the address to my apartment and hoped that she would be as excited as my family was. When she showed up, she said I need to get married since I’m sleeping with a guy. When I said I wouldn’t right now, she said she would not speak to me until I was married and that I would pay for my sins. She has lived up to her word this whole time that I’ve been living with him. It hurt me that she wasn’t there to help me move or just be happy for me. I think in a way I was looking for her approval.

Fast forward to now, my amazing fiancé proposed recently. He met up with her to ask for my hand in marriage and said that she has been praying for this since we first moved out.

I understand that she is religious and has her own beliefs but I don’t get how she can cut me off from her life completely. I don’t regret moving in with him, we’ve created a life where I finally have a place where I can call home and I feel safe.

I have not called her to tell her I’m engaged and my sisters are telling me it’s the right thing to do but I honestly don’t know what to do.

It hurt me so much that she would not support me the way I have supported her all my life with the wrong decisions she has made. I’ve always been there for her even though she emotionally abandoned me. When I’ve tried to bring it up in the past, she said she never had to check up on me because since she prayed for me, I will always be protected by god.

At this point I don’t think she has the right to be included in my life but some part of me has always wanted her love and approval.

What do I do?