This is from your thread last year:
“Iv thought about this ever since you posted it and had a little cry this evening.
iv fucked up and it hurts to admit it but the truth is, yes I do tell her that her siblings aren’t her siblings and her step mum isn’t her step mum, because it hurts to think that he’s given her a family and I haven’t yet. I never wanted her to grow up on a split family. When I get angry (not just about this) but it’s like i see red and I can’t calm down and I do get nasty.”
Looking at your previous threads it’s obvious you are still hurt by her father leaving you and I think you need to work through that trauma so you can free yourself and move on.
Holding unto past hurt and truama like this will manifest in other areas of your lives including your current relationship and we can see it is leaking into your child’s relationship with her siblings.
Maybe look into seeing a therapist to talk through what happened, how it affected you and how to let it go.
It’s obvious there are other underlying issues at play and it is not just that you think she should call them step brothers and sisters to avoid confusion, it’s because it triggers something in you and as you said in the quote above you harbor hurt that he was able to give her a family of siblings which you haven’t been able to.
I appreciate that you were able to express how you feel and I will implore you to seek help to dig deeper and work through the issues for your sake, for your daughters sake, for the sake of your current relationship.
Holding unto hurt, anger and trauma like this is unhealthy.