No desire to have a relationship with my mom

As the title says, I have no desire to have a relationship with my mom. She was verbally and sometimes physically abusive to me growing up, and emotionally abusive to this day. I now have my own child and can see how bad my childhood was. But she’s a very popular person in our town, no one would suspect she abused her children at home. I have stopped talking to her to preserve my own mental health. I didn’t intend to take a break for so long but it’s already been almost 3 months and I just find myself not wanting to reach out to her at all. At first she tried to contact me and apologized, but I just don’t believe her apology. She said she’d do anything to have a relationship with me and my son, but I find myself so uninterested in her and the idea of going back to her makes me super anxious and scared like a little kid. She told me that raising my son would be a ‘living hell’ and how she screamed at me as a baby for not napping and other horrible stuff about being a parent and I just don’t see it. I absolutely love being a mom and don’t feel any of the resentment or hatred toward my son that she felt for me.

Does anyone else feel this way about their mom? Would these feelings come from no where/is it possible I’m making them up?

Is there a moral obligation to have a relationship with your mom? I have some family events that she’ll be at and I’m dreading them. They’re not until July but I don’t know how I’ll face her and think I might have to have a conversation with her before those events so it’s not awkward at the parties.

Edit to add, even though it’s been almost 3 months since I spoke to her, I can’t stop obsessing with wondering if I’m doing the wrong thing, or how I can make our relationship work, or reliving traumatic memories of my childhood. I wish I could quiet my mind, and I’m wondering if talking to her and just going low contact instead of no contact would help me feel less guilty.