She was in the last manga/episode of DBZ. She appeared in GT... but it seems like she has been wiped clean from Battle of the Gods, Resurrection of Frieza and now Dragon Ball Super.
Isn't she (and Pan) from much later on in the timeline?
By the time Bra was a kindergartener, Trunks and Goten were nearing adulthood, and Gohan and Videl were married with Pan as their daughter (around the same age as Bra).
A theory going around is that the night Bulma slapped Goku (ie before that, when Bills hit Bulma and Vegeta lost his temper), she was so pleased with Vegeta that Bulla was conceived that night.
I don't know if that's accurate, but it makes sense.
07/08/06... 786... the sentinel of Allah has arrived.
According to Daizenshû 7, in the official Dragon Ball Timeline, Bra (aka Bura/Bulla) was born in year 780, and Pan was born in year 778. That's why in the recent movies there are references about Pan, but not about Bra (because she hasn't been conceived yet).
Officialy, Bra is 2 years younger than Pan. I'm looking forward to see her in "Dragon Ball Super"!
Please excuse my terrible redaction, english is not my native language IMDb = Catch-22