I don't know where it's come from but DD, when she's tired or grumpy, says she's stupid. I find this really upsetting and no amount of reassurance will convince her that she's not. She says no-one else has said she's stupid and she won't pin it down to anything (because she can't do X for example). She does get frustrated when she can't get things 'right' and she has very specific ideas about how things should be sometimes. What can we do? It's an awful thing for a child to say about themselves- should I ask her teacher? Y1 at school so she's v tired from the intense reading, writing etc.