So far in the past 4 hours Matilda has reported, tearfully, that she does not like Kindergarten and she does not want to go AND, giddily, that she LOVES her Kindergarten. Thankfully it is trending more towards love as she's gotten some food, drink and rest. She ate all but one of her California rolls (claiming she saved the other for Porter - so sweet), but did not appear to eat or drink anything else during her 7 hours at school. That may explain a lot of the walk home melt down.
I am patiently trying to coax more and more details out of her so we'll see how it all settles out.