People can be really insensitive. Compound that with the level of some people working fast food outlets and things are possible. As a general rule they do not employ rocket scientists. It may have just been a kid. Of course the situation may have been well embellished too as that's what the media does.

The only thing I can think of is with the childs inability to eat normally. That portion may have been quite a spectacle if she got to that stage. With all kinds of abnormal noises etc. Asked to leave based only on appearances is wrong of course. Becoming cognizant of her appearance because of the event if it occured worried me from an authenticity perspective. Logically at her age this did not add up to me and sounds like something generated by the parent or media.

Then in litigation heaven being the United States. If it did not happen you would thing KFC would be really on to someone. They would rightly see it as an attack on them.