Your original posts did seem to have an air of annoyance about them to me (the fact you posted it in the first place suggested to me you were a bit annoyed that you hadn't been told, to be honest). Apologies if that wasn't the case but tone is quite difficult to read in the written word. I wouldn't have thought I was the only one who thought you were annoyed after reading those opening posts.
You say you didn't intend to tell her until "after she breaks up for the summer". I appreciate now that that might mean the end of July, rather than September (children finish nurseries at different times, children at private nurseries may not finish until the end of August/early September. I read this very late last night so I apologise if I misinterpreted that part). Regardless of when she finishes though, I hope you now realise that waiting until then to start informing her and preparing her for school is far too late. She needs the proper closure when she leaves her nursery of knowing what is to come next. She needs to visit the new school in July to engage with their transition program.
I'm sorry you were unsighted by this development but, as you've since found out from these replies, it would be very unusual for the school to actually inform the parents directly about when they intend to visit their child at nursery. As I said, if anyone was to inform the parents, I'd assume it to be the nursery as they'd know about it in advance and could easily give a heads up "by the way, Miss from is coming to see tomorrow". I wouldn't automatically expect them to though.
Going forward, I hope you are able to involve your daughter in every aspect of the transition as possible. She deserves to understand what school is going to look like (ie a different building to her current nursery, with different children) to help her fully prepare and understand. Look on this surprise development as a real positive that she's now met her new teacher, which is the first step. Assuming you know their name, you can now start dropping it in to conversations with your child about school. Children are resilient. I see no reason why she can't enjoy a smooth transition and settle in quickly despite the school not being your first choice. Good luck.