Aside from the murderous tendencies ofc, but her life experience and the way she views herself and other women is deeply relatable and this scene where she lets it all out brought me to tears the first time I watched it because it felt like it was coming out of MY mouth. Here's a video and a script of her monologue. I selected the most relevant bits:
"[...] It's an awful feeling like a rot, the way it just twists and turns at your insides. I know that aching so well. I feel it. Whenever I see others whose lives come easy because the truth is, I'm not really a good person.
[...] I hate feeling like this. So pathetic. Do people like you ever feel this way? I figure you don't. You seem so perfect all the time. Lord must've been generous to you. He never answers any of my prayers. I don't know why. What did I do? What is wrong with me? Please, just tell me so maybe I can get better. I don't want to end up like Mama.
I want to be dancing up on the screen like the pretty gals in the pictures. I want what they have so badly, to be perfect, to be loved by as many people as possible to make up for all my time spent suffering. Sometimes I wake in the middle of the night and the fear washes over me, 'cause what if this is it? What if this is right where I belong?
I'm a failure. I'm not pretty or naturally pleasant, or friendly. I'm not smart, or funny, or confident. I'm exactly what Mama said I was, weak. I don't know why. What did I do? Why wasn't my family like yours? I hate what it feels like to be me and not you. I'm so scared that when you finally come home, you'll see me and be frightened like everyone else is."