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Thank you Jamesnan. From your answer, it sounds as though I am doing everything wrong. I do make quite a big fuss over it, but it's because I am genuinely worried. She does probably see that I get frustrated, and then spend half an hour trying to sweet talk her into eating something. I will try what you say. Thankyou :-)
Cazz, Would you count things like grapes and yogurts as snacks? She does eat these between meals and, as stupid as that now sounds in relation to my original question, I let her have them because I just think well at least I know she's had something. It's really difficult not to give in, as she gets really upset and throws herself on the floor if I say she can't have yogurts or fruit. I realise I'm not helping the situation by doing this, but I just worry that if I don't give her that, then she'll have nothing.
I will do as you have both suggested, starting from when she comes home from school.
Thank you both :-)