Magic, if the little one is a coeliac then it is highly likely that she is both wheat and gluten intolerant and on top of that super sensitive.

What I mean by that is that you have to be extra careful with cross contamantion. That is, if you do make up gluten free mixes (which are yummy by the way) and it says to use margarine, then use a brand new margarine, not one that has knifes in it that make have your bread crumbs. If you are chopping up veg/fruit then use a clean board and a clean knife - freshly washed. I am a coeliac and I can get sick from actual crumbs.. so it is a nightmare for me to go anywhere.

Ask the mum how sensitive she is... if she was worried about cross containmentation she should have mentioned it.

Just make sure that stuff says gluten free on it... the health food section of the supermarket have a fairly good range. That's where you'll find the cake/muffin mixes.

Let me know if you want any more info, I could be here for hours and pages explaining stuff but if there was anything specific, feel free to ask.

Can I also say that its great you are catering for her? So many times I have been invited somewhere then have to take my own stuff because the hosts can't be bothered finding out. (whoops off soapbox now)