Hmmm, so it seems to be a common age thing then.

After I wrote the OP out, she came up to me and asked for yoghurt. I nearly fell over while going for the fridge and she ate the lot. But she didn't touch her sandwich.

She refuses to use cutlery of any sort, considers them a drum stick rather than a food server. Wonder if that's got anything to do with it. She doesn't want to use her hands, but she doesn't like her cutlery. The only way she'll eat yoghurt is if I feed it to her.