This is for pre-K, right? It does make me wonder a little how they are recruiting -- and also, whether they are really training OR supporting -- teachers at that level. I'm not clear whether all schools have very sound procedures for pre-K.
Where I grew up, it felt to me (as a child) like a very separate institution and from what I fuzzily recall, it was more like a fluffy, perhaps kind of volunteer-ish, community outfit. At least, it was in a different location and it all felt very informal. So personally I'm not used to thinking of pre-K as being part of a hugely formal "school" system with long manuals and principals intervening in everything. Though if that were even the case where I was, I never would have known as a child. I had no idea what a principal was at that age. Even in elementary, they were really distant, weird figures to me. I think I knew the teachers were sort of "afraid" of them, and I always just wondered why and whatever that was about. (But I was never the focus of their attention either for anything bad, hmm.)
All that being said, yeah, if the pre-K is actually integrated into a larger formal school and they're responsible for it... I would expect them to have some higher standards for who is in charge and just how it's run. And I would expect them to give those teachers resources and support, such that they wouldn't need to send letters off by hand. But did they?