What's wrong with her?!?!?

Okay....I'm 32 and my mom is 50. She was fine this morning when we talked on the phone, then she sent me a text being hateful because I was friends with one of her friends she unfriended on fb. Come to find out she was mad because he was going to see her sister. Seriously?!?!? They were neighbors growing up. She said if I didn't unfriend him, she would me. We always say I love you when we end conversations, but her last texts did not. What's her problem? I've been dealing with this crap for as long as I can remember. She even does this in front of my kids. We have even gotten into a fist fight when my oldest was 2. If she doesn't get her way, she gets mad a lot of the time. She's also had a hysterectomy when I was 17 so I don't think it's hormones. Thanks!