DD is 12. Mild mannered, gentle and kind and very sociable. Her stepdad and I have a close open and honest relationship with her. Her father and I (three DC together) are separated six years. We are amicable although differing parenting styles, I don't interfere with his choices and respect he has the right to parent the way he sees fit. I don't always get the same respect back, and occasionally we argue over text, but generally very little conflict.
Increasingly over the last few years she has been saying she doesn't want to go to his to stay (one night in the week and alternate full weekends. He doesn't live in the same town as us but is fairly close). I've always gently encouraged her to go, I want to protect her relationship with him.
Recently she confided in us that she doesn't like the way he speaks to her. He treats her differently to her brothers. He doesn't allow her to see her friends, partly because he won't give her any independence and he also refuses to facilitate any social stuff for her (driving her places etc). He says things to her like: "you always cry and make everything worse" "I don't know why you bother coming if you don't want to spend time with me" (when she's asked to see her friends at the weekend - this phrase happens regularly). He also refuses to let her have her phone much so she feels very isolated from her friends.
She said to me "I've looked it up and the way he talks to me is manipulative."🥺
The problem is: she absolutely doesn't want him to know she doesn't want to go. She loves him and doesn't want to hurt his feelings. She has made me promise I won't talk to him, and my instinct is to respect that. Yesterday she was in floods of tears as I was driving her over, she put on a brave face and wiped her eyes smiling as she went in.
AIBU in respecting her, or should I intervene to protect her? Please help, my baby is hurting and I don't know what to do.