I am not really sure. I did not think they could make her sick, only if she eats alot of them. I read of a ferret care site that you should let your ferret try anything you eat, just to see what all they like. I do know they are lactose intolerant, just like cats, but when she had her first vet visit/vax my vet said that anything is bad in access, but a few here and there are not bad for them.
I will have to look more into it. Sorry to be nasty and gross, but her poop looks great, lol. I mean no runnies and she goes regularly.
ps- Kisses will be given