Interestingly, we briefly had this issue (just a little; it was minor) but now have the opposite--DD says she is stupid, dumb, etc. (I don't think she believes this. She's fishing, but also has low self-esteem.)
My daughter went through this too - but it was before the braggy phase. She was around 5 - and could do no right in her own eyes. I don't think she was fishing - I think it was related to her perfectionism.
It was really hard to deal with - I didn't know what to do. On the one hand, telling her that she's done fine "But I like your drawing! It's
not awful" ...gives her positive feed back, but if you have to say it as often as we did, you wonder if it sounds fake to the child. Thank heavens she outgrew it.
