I did some quick Internet research, yes that robust girl is Flora and Airto's daughter alright. Her name is
Diana Booker and she's married to the band's percussionist
Krishna Booker. Diana has inherited her mother's face and hair and that voice --- sounds just like Flora in her twenties. You could close your eyes and not tell the difference except for having less of a Portugese accent because she's an American. Her rendition of "Bridges" with just electric piano and voice, first sung in the original portugese, then segued to English, sent chills up my spine, and I don't even like the song all that much! Also dug that Nina Simone blues song.
Diana and Krishna's own music borders on nu jazz and triphop, a little taste of what we heard in the concert. I also find it interesting that Flora's daughter (a singer) wound up marrying a percussionist as well.
Some info on Diana:
http://www.lamusicacademy.com/departments/vocals/instructors.aspOther trivia - Krishna is Wayne Shorter's nephew.
I also checked up on the bassist Gary Brown - he's American as well. Maybe the other musicians are american as well, but hanging out with Flora and Airto allows them to "carry" the brazillian vibe quite well.