Maria is the vampire who changed Jasper, and a major participant in the GSVW. She had "Mexican looking features" but in a demonstration of how totally non racist the books are, she had become white on becoming a Meyerpire. She had a tendency to betray people, and only failed to betray and kill Jasper because he left first. She also changed 2 other girls-Lucy and Nettie.
The Solution Edit
Jasper stayed with Maria a long time, but when Peter beckoned promising a life that consisted of more than killing random people and bossing around newborns, Jasper left Maria for good. He was glad that he did not kill Maria, despite him being a hardened monster and everything.
Maria may have gone on to become a governess who enjoyed singing songs about lonely goats.