Rachel, You, like Michele, would also be a 4th great-granddaughter of Juan Manuel Baca (Vaca) of Vacaville fame who came to California from New Mexico in 1841. I have traced the family ancestry back fourteen generations before you to Juan de Vaca from Mexico City who may have been with Vasquez de Coronado on his famous expedition in the Southwest (1540-1542). Please contact me if you would like more information. I'd like to get updated on your branch of the Vaca family too.
--A.V.King
Los Angeles, CA