Thanks for posting this song. It has such a beautiful melody; I hope somone posts that> too.
I know formal, schoolboy Spanish, but no colloquialisms, so if this song has 'em I'm sunk. The last verse you quote, however, could be translated as
They all call me the Dark One, the Weeping Woman
Dark but caring...
I am like a green chili,
biting but stern...
Hope this helps.