What we really know about of La LIorana?

I was asked to look into a case from a dear friend for his friend, a missing child, but what puzzled me is the family think that La LIorana took their son and I have a dilemma with this, my job is based on evidences and not on Urban Legends or fiction? And what we really know about of La LIorana? Now let me give you a basic story about this special character, Maria (La Llorona) is a beautiful woman married or the mistress of a rich and handsome man. She has three (sometimes two) children from her husband or a previous relationship. Then, Maria's beloved starts to work out of town. Then she is either deceived or left by her lover or she feels her children have become an obstacle to their union so she takes them to the river and drowns them. When she realizes what she has done, she starts to cry for her children and kills herself. The next morning, a traveler brought word to the villagers that a beautiful woman lay dead on the bank of the river. That is where they found Maria, and they laid her to rest where she had fallen. But the first night Maria was in the grave, the villagers heard the sound of crying down by the river. It was not the wind, it was La Llorona crying. "Where are my children?" And they saw a woman walking up and down the bank of the river, dressed in a long white robe, the way they had dressed Maria for burial. On many a dark night they saw her walk the river bank and cry for her children. And so they no longer spoke of her as Maria. They called her La Llorona, the weeping woman. And by that name she is known to this day. Children are warned not to go out in the dark, for, La Llorona might snatch them and never return them. 

It is also said that when Maria reached the gates of heaven, the Lord asks her "Where are your children?" Maria answers "I don't know, my Lord." The Lord then says "You shall not enter these gates without your children." From that point on, Maria is doomed to roam the Earth in search of her children in the rivers and streams of the Americas. Now we have La LIorona in different parts of the world like: Guatemala, United States, Mexico, Honduras, El Salvador, Panama, Chile, Venezuela, Well I did my homework and my conclusion are that if it hasn't been disprove beyond reasonable doubt then there is always the potential for existence well I’m not sure 

I don’t believe till I see but I know a couple of people who have seen her. So real or a legend??? I love your comments It will help me to make a decision if I will take that case or not!! 

Lanfranco Crescentini

Private Investigator

California PI License # PI. 18368