Cai that is really wierd cos I know of a similar story (sort of).

I have a book of stories that my class wrote in Year 1, so about 6yo too. I read back through them not long ago & noticed one little boy had written in his "I slit my wrists". I lived across the road from them, his parents were friends with mine & we were friends and there was nothing in the family that would lead to him saying that. As in it wasn't something that had happened to anyone he knew IYKWIM. So it was just a really odd thing for him to write.

IKWYM about the regular threats in the palyground, but yup I think that was very full on for a little girl to be saying...