I'm just going to suggest why the timing of the texts.
One of mine used to do this.
Bedtime on Sunday night. Get to bed. Their light goes off after reading, give them good night kiss, they usually go off to sleep within 20 minutes.
At some point, depending on what I'm doing, I go past the door and realise they're crying.
When I go in they say they're worried about going to school because of X.
X can be a big thing, or it can be something very very little. But they've shown no signs over the weekend (or the previous week, and occasionally longer) of being upset, but they've obviously been worrying about it until it's burst out-often on Sunday night.
Now one of my dc has a wonderful imagination. So a little thing like A dropped her pencil on her foot by accident on Monday could easily by the time she's worried about it for a week it's expanded to A threw her pencil on purpose, B then poked her twenty times and the whole school laughed at her because she was crying.
Luckily I had a friend who had a similar child and we used to phone each other up and say "have you heard anything about this?" Both our dc were also chatterboxes, so tended to tell anything big happening.
So if the other mum said "not heard anything" we'd mutually have a chuckle over the imagination of our dc, and assume it was something and nothing, comfort own child and that would usually be the end of that.
However occasionally the response would be along the lines of "actually she did say that dc had a really nasty fall in the playground and A had pushed her over" and then we would assess (on our own usually) whether it was something we needed to follow up.
I never, and I'm certain she didn't either, discussed it with other people. But it meant that we were able to reassure the dc when it was a little thing, and act when it was a big thing, rather than bothering the teacher over something tiny, or not acting when it was something that needed an eye keeping on.