Answer
The answer is Doña Bárbara. This nickname originates from the character and title of a famous novel written by Venezuelan author Rómulo Gallegos. The main character of the novel is Doña Bárbara, a wealthy and ruthless rancher who becomes a symbol of power and brutality. María's association with this character highlights her strength, independence, and potential fierceness when defending her beliefs and protecting those she cares about.