I don't know if that's insecurity like, you expected ro hoped you'd get to do certain things with your kid, and now someone else is doing them. I think the same kind of thing can happen when you're co‑parenting, like teaching your child to ride a bike while the other parent is at work... If you have a good working relationship with your ex, you could bring up the stuff that's important for you to teach your daughter. Hopefully she'll be willing to keep that in mind and at least check in with you first.