Isabel Hurtado de Mendoza

Does anyone know who Isabel Hurtado de Mendoza is? She would of been born around 1530 in Mexico City. Her father was said to be Diego Hurtado de Mendoza, a Spanish Conquistador, and the grandchild of
Rodrigo Hurtado de Mendoza, the Marquis of Cenete. Other sources said this is inaccurate and there is no evidence for this. I think many of us on Ranchos descend from Isabel de Mendoza through the Ruiz de Esparza and Lopez de Elisalde lines. Is there any Mexico City Records or anything during that period that could prove this? and find out who she exactly is? Any assistance is helpful. Thanks. -Daniel Mendez del Camino