Did a Google.
http://aztlan.net/juandiego.htm She told Juan Diego to pick the Castilian roses, which do not exist in that climate but were miraculously growing right in front of him. He gathered them using his tilma and approached the church dignitary. Juan Diego unfolded his tilma and the bishop saw that emblazoned on the front was a beautiful olive skin lady and the miraculous blossoms laying at her feet.
The bishop asked Juan Diego who the lady was and he answered Tecuauhtlacuepeuh which in Nahuatl sounds like "guadalupe". The bishop associated the lady with the Muslim Spanish Madonna "Our Lady of Guadalupe" that was venerated high in the Estremadura Mountains of Spain.