aw, we ALL have had those moments... I try to have a sense of humor about it but I know you're worried your dd may have hurt the other mom's feelings, etc.
but truthfully, its just one of those things that kids do and teaching social grace is a tricky and delicate proposition. basically I've just tried to explain to my 6 yo dd that to comment on someone else's appearance in public is considered rude and teaching her how to be discreet is hard, but she's getting better...
as far as explaining the differences of the special needs child, I usually say something to the effect of "that's just how they were made" but as she's gotten older I have been a little more specific... she saw a child with DS this summer and asked why "that boy's head was oval"... she wasn't mean about it, just curious.
she's typically developing and her little bro has 22q11 and severe clubfeet so she lives with 'differences' everyday which does lend itself to some very positive teaching moments and also, as a mommy on both ends of this equation, I will say that I know my son is different and if I overhead a totally innocent conversation about that from other young kids it wouldn't shock or hurt me... if they were close enough I'd probably explain in kid-terms, what those differences were.
hope that helps! just my 2 cents worth
