Thankyou all so much for your comments. I think I will let sleeping dogs lie and not broach the subject with her.
I think that's very wise, Gingster
The recent publicity about the British Gymnastics team was very worrying, I thought. We have skinny gymnasts in the family and I wouldn't like to think they worried about their weight, causing problems as they get older.
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I wouldn't worry as she sounds active enough and so long as she's fit and healthy so no problem. Your DD probably realises that she's put on a bit of weight, but doesn't need reminding.