It happened to me once. I got a phone-call to collect dd1 from school as she was complaining of a pain in her tummy. Her teachers were all lovely. Genuinely kind teachers and she adored them. When I arrived, her teacher asked whether everything was alright at home, because she said it's most unlike her - 'Is everything ok at home?'. I of course lied and said that everything was fine, but in fact, the teacher was spot on - something had happened the day before. DD1 always loved school but the teacher could sense that there was nothing up with her physically, but that there was something up. You don't get that sort of intuition or concern from most teachers I suspect, but I was appreciative that she was totally attuned to dd - probably saw her more hours of the day than I did really!
Has anyone else had a kind teacher pick up on something?
TBH I didn't even realise that dd had picked up on anything being wrong, but it clearly had affected her. She just wanted to come home to see that I was ok.