I want to "correct" my daughters accent, can you trust that it will be okay with her?
What the heck? Really? Is that right? What is the reason for that?
I want her to master the snobby England's English.
Accents gives us distinct connection with our culture. You shouldn't try to get rid of it.
How does that make sense? I don't understand.
Loosing an accent should be up to the person it belongs to. Correcting anything of your daughter's language just for this reason seems to be petty. Let her speak the way she wants to.