I haven't heard about any recall of Barbie dolls themselves (some of the accessories, yes) so I think you are safe with those. Were the barbies you sold vintage ones or just alot of newer Barbies? I have never come across a vintage Barbie at a thrift.
Funny thing once on the Kovel's antiques website not long ago they were recommending that people buy a Barbie accessory set that contained Barbie's dogs and all their things like brushes, dog bowls, etc. They predicted this set would be very collectible in the future because it had so many little parts. Not long after that set was recalled due to lead paint. Someone emailed Kovels to ask whether that would hurt the value in the future and they said yes because it would not have been a set that was played with or owned by many. I would think it would help the value because alot of people would return it, but anyway it was funny because that was the first time I saw them recommending people to buy something as a future collectible then it turned out to be defective.
http://www.news-antique.com/?id=781973