I know Barb and I would give her the benefit of the doubt. I didn't receive that email so I suspect that if it was only sent to 220 people it certainly was not a list provided by KCBS, or gathered through them - or you would expect more people to be included.
Finally, Barb knows BBQ, no doubt, but it may be possible she is not as savvy about the difference between CC and BCC. I'd give her a break - and your vote! :)