Aaaah, Margo, if only I did (have tips). I think many LOs of around your and my dd1's ages are going a little nuts now - being the end of the holidays etc. I agree with cutting slack, whilst holding on to whatever boundaries you hold dear
I think dd1 is suffering from boredom, lack of structure, and pre-school nerves all mixed up.
EV, am impressed with the list of clear and practical worries your dd was able to list. I asked mine about big school tonight, and how she felt, and her main concern was being stuck with the one friend she knows 'who isn't always very nice to me, Mummy'. No worries about where the loos are, or getting lost etc - she trusts the teacher she met to show her all that, but she's quite upset that none of her friends are going to the same school. And grabbed my arm and said 'I don't want to go, I want to stay with you forever'...
...I'll remind her of that, when she's 16