She is the one the Mexicans claim to pray to as they enter the United States illegally? Sorry, she has no stock with me.
Her other name was/is Tonantzin...an Aztec diety that was converted to a Saint in order to convince the locals to worship her.
http://www.mexconnect.com/articles/2614-our-lady-of-guadalupe-tonantzin-or-the-virgin-mary