@Ostryga
i wonder if it would help you explain this to your Dd if you framed it another way . So not so much “ he chose her over you “ but more that he’s not able to be a very good parent. A bit like what @Odiebay said.
Id ask your Dd to imagine that she had a tiny kitten / puppy and it was her job to look after it and protect it. Would she leave her puppy with someone that she knew would be cruel to it/ shouts at it / hit it / not feed it ?
What would she do if she was in the park and a big dog came and growled at her tiny puppy? No doubt she will say “ run away with the puppy “ or “ pick up the puppy “ or “ ask someone for help “.
Perhaps you can use an example that’s more like what happened to her. hopefully all of responses she gives will be about protecting the puppy / keeping it safe.
Then Explain that’s a bit like being a parent, that even though she’s only 7 she understands that, that she has good instincts / is kind/ responsible etc
But not all adults are able to protect their children and keep them safe. And that her dad was only thinking about what he wanted (eg going to the pub ) that he didn’t chose a good person to look after her.
And that’s why he is not allowed to see her right now, because he’s not very good at being a parent. And the most important thing is that she is safe.
And that’s also why she did the right thing to tell you ( about the abuse ) , that she made a good choice / was very brave / grown up etc .Amd that she must always tell you if anyone else does something to hurt her / scare her.
So it’s not so much him choosing his partner over her. And it’s certainly
NOT because she told about the abuse. It’s because the adults around her ( you/ social services / rest of your family / teachers / whoever ) have decided that he can’t see her because he can’t keep her safe.
and it’s ok for her to be sad about that and miss him ( if she does ).
I think it’s important that she’s knows it’s a decision taken by adults who care for her to keep her safe, that she might not understand it or agree with it and that’s ok. It’s a decision made with her welfare at the centre.