Is the blue lady real

There are many different legends involving a Blue Lady, but the one I'm most familiar with is the Blue Lady who visited the Native Americans and spread Christianity, before the Conquistadors. She was said to be a ghost who appeared to various tribes and spread the Word of God alone. She also foretold more white men coming to spread the Word of God. This refers to the Conquistadors. No one knows who the Blue Lady really was, but some believe she may have been an apparition of Mary, The Blessed Mother.