That is so true! They also don't tell us everything, for a
variety of reasons, so all we have really is their intuition, and
perhaps a change in their behaviour or attitude about school. My
son faced a lot of bullying from a Teacher's assistant in
kindergarten, I didn't understand what was happening until I
witnessed her yelling at him and belittling him in the hallway.
He had started to cry anytime we read stories at home, before
kindergarten story time was fun and he would ask questions and
make comments about the story- not so much in kindergarten.