SirVixofVixHall good posts.
Supermagicsmile "...I wonder if some of the people saying they would be fine with it would be if they actually experienced it."!
I think lots of people would not be happy with this.
Is there reason you feel a sense of insecurity? (if you do)
I knew a woman who was divorced and one of her children went to live with the dad for a school opportunity, dad and his new wife and either her kids or their kids together, can't quite remember. Then the other daughter joined 'the family'. It was so heart breaking for the mum. Do you have any worries this step mum wants to kind of take over?
I think if the step mum is kind, great. But she doesn't need extra time with your dd or to view her as a daughter not a step daughter.
I do wonder if your specific situation is in some way a part of this, in that your ex was with her before you, then with you and now back with her. I just wonder if this dynamic has added something to the situation?
Sorry if I am barking up the wrong tree.
To me it might make it more likely that she wants to pretend your dd is hers because that would remove the time when she was not with him and you were. That just really struck me, but I could be wrong.
Re Facebook, remember OP she can unfriend you and you would not know what she was writing so go 'nicely' if you do want to speak to her about this.
As I said before, you know her, and what your dd says. You know if this is a genuinely good relationship.
Of course it is good if she genuinely cares for your dd, and hopefully you can work this all out amicably. But I would not be relinquishing any of my time with my child, if she wants to foster good relationships between the kids why don't you and she meet up with kids, without the man, maybe at a local park etc or soft play.
This might show your dd a good, united front with both children with their own mums. When your dd is older it will be very good if you and her step mum can be on the same page together. As mum to an almost teenager, I would say that this is a very testing time (teens and pre teens), and so now you have a good few years to make your relationship (with step mum) better in readiness for the teenage years.