posted previously, Chiquinha was born early enough to fight against slavery in Brazil (it was abolished in 1888), but lived long enough (1935) to be a major influence, friend and mentor to Villa-Lobos.
There are some good resources about Chiquinha online, from a basic English Wikipedia page to the official site (in Portuguese) at http://www.chiquinhagonzaga.com. The picture to the left, which shows Chiquinha at the time of her first success as a composer in 1877, is from that excellent site. Also there are links to YouTube videos and PDF versions of sheet music.
A CD I highly recommend is Luciana Soares' Brasileira: Piano Music by Brazilian Women, on the Centaur label, from 2007.