12 yr old dd eating loads but also strangely obsessive about food

[Ledkr]

Dd is 12,5 and very slim and also active.
She has always enjoyed food padticularky junk which we obviously limit but ears a varied diet.
Recdvtku tho she has become really greedy and obsessed with food.
We are on holiday at the moment in France so lots if temptation but she is either eating or asking for food more than ever.
She is snappy about sharing anything too, had a tube of Pringles she was scoffing but then got arsey when others took some!!
It's hard cos I don't want to give her food issues it surely she can't be like this.
I have 3 adult sons and don't remember them being like it.