I don't know what a calippo is, but if your DIL has said no, you shouldn't give it to your granddaughter.
My children were brought up vegetarian, but there were several older people who thought we were being OTT, and that they knew best. They didn't.
We wanted them to avoid all meat products as they were born in the early 90s, when BSE was at its height. My mum thought it was 'ridiculous' (ie too much effort) to check things like biscuits for gelatine, and one school dinner lady told my son that it was ok for him to have turkey dinosaurs if he picked the stegosaurus, because stegosauruses (stegosaurii??
) were herbivores.
It's really not ok to overrule parents on things like this. Frankly, I think being lost and deeply upset is a massive over-reaction to being asked to respect a mother's choice to do as she feels best by her children.