Zero judgement from me.
I wanted to ask you if you have looked into the possibility of you have ppd or ppa back then. Both of these can cause us moms to not feel connected to our kids. And the more we struggle to connect the more they struggle too.
There is nothing wrong with having your daugther stay or live with her father primarily. But it seems like this hurts you. If that's the case possible family counseling for you two can definitely help. And I'd recommended it either way.
Learning to bond is important for all kids and some of us need to be taugh too.
Also I just wanted to say, I honestly hate when I feel like I'm constantly yelling or nagging or on edge. It sucks for everyone. I, now, just say it. I tell my family when it sucks. Its frustrating when things get too much.
I think you need to do what you feel is best. Even if its temporary. Even if it's long term. But I feel like its important to say. Parenting a 6 year old is hard. And if you aren't feeling a bond it's even harder. I'd get some support to help you build a bond.

Have you tried to discipline rather than screaming at her? Screaming doesn’t solve anything. She may be acting out for attention from you. Maybe she’s had a rough time with the separation. Have you thought about counseling for yourself and the little girl?

It's always what's in the best interest of the child. Always. Even if it's the hardest thing ever to do. 💕

Do what you feel is best for your baby. My oldest lives with his father because all he would do is mope around and not play and cry to go back to his dad's house. It hurt to let him go but it hurt even more to see him like that. His dad agreed that he thought it would be good for him. Talk to her dad and see what he thinks. Good luck!!