She is the patron Saint of the Americas whose feast day is December 12th.
The story of the Virgin de Guadalupe:
There was a poor Aztec Indian named Juan Diego. One day as Juan was walking through the Tepayac hill country in central Mexico he encountered a beautiful woman surrounded by a ball of light as bright as the sun. Speaking in his native tongue, the beautiful lady identified herself:
“My dear little son, I love you. I desire you to know who I am. I am the ever-virgin Mary, Mother of the true God who gives life and maintains its existence. He created all things. He is in all places. He is Lord of Heaven and Earth. I desire a church in this place where your people may experience my compassion. All those who sincerely ask my help in their work and in their sorrows will know my Mother’s Heart in this place. Here I will see their tears; I will console them and they will be at peace. So run now to Tenochtitlan and tell the Bishop all that you have seen and heard.”