AITAH for blocking all contact with my (Now) ex-best friend?

My best friend (18F) and I, (18F) were best friends for 4 years. We started being best friends when we were 13. I’ll call my ex-best friend Bella. Well when me and her were 16, I told my mom that Bella’s mom was abusing her. One day, Bella ran away to my house unexpectedly. She told me that HER mom was suffocating, and hitting her. Of course I let Bella in, and we were talking about it. Soon I gained the confidence to tell my mom. My mom went outside and started talking to Bella about what she wanted to do. Our only options were to call the Police, call CPS, or make her go back home. Me and Bella decided to call CPS, OUTSIDE. Being outside was the worst decision EVER.

We told the lady on the phone what happened between Bella and her mom. Bella’s mom finally found Bella at my house, and took her. Bad news now: Bella’s abusive mom knows my family’s address. Bella admitted she told her mom that we called CPS, and I was already disappointed at that. After a few months I forgot about that day.

One day I woke up, and my mom said, “Mia! Why did Child Protective Services call me and say you are suicidal?!” I was genuinely so confused but I said that I called CPS a few months ago, but it was for Bella NOT me. I never said anything about someone being suicidal. My mom told me someone was coming to our house to check on us. I had to get ready CRYING which was already a bad start because I was emotional. (I was on my period.)

After I got ready, CPS came and talked to us, I was genuinely confused because CPS said that the caller said I had lice, rashes, I was underweight, abused, and my parents yelled at me. I have fast metabolism, and eczema which is not a rash. But I certainly DO NOT have lice, nor was I being abused. Then we told CPS that day that Bella was being abused, and her mom had been yelling at her, because we thought it was about that call about Bella, even though we never said anything about that. But me and my parents were suspicious of Bella’s mom because my mom and me KNOW that Bella’s mom is manipulative. After CPS left, I told Bella that we thought her mom called CPS on my mom and dad. Bella said, “wait, my mom wasn’t joking?” I genuinely felt so betrayed and showed my mom. My mom said to block bella on EVERYTHING. I started crying but blocked her on messages and all of social media.

When I was 17-18 Bella still tried contacting me on Alt accounts, and different numbers. I told her I do not want anything to do with her and blocked her on those accounts. Bella got mad at me and said, “Why are you even blocking me, I did nothing?” The thing is, is that i’m scared that She will become like her mom, and that her mom will do something bad again. I still live in the same house, and have a fear that Bella’s mom is going to come to my house. So, AITAH?