I'm not sure specifically which 'Mary Elnor' you are referring to. There could be many people with that name. More details would be helpful to tell the true story.
Well, it could be about her career. Maybe she was a great artist and her true story involves her journey in the art world, from her first attempts at creating art to her exhibitions. Or she could have been a social activist, and her story might revolve around the causes she fought for.
The truthfulness of the Mary Stauffer story can be a complex matter. It could involve elements of truth mixed with creative interpretation or exaggeration. More investigation is often required to establish its authenticity.
I'm not sure. It depends on the context and the source of the story. Sometimes stories like this can be based on real events but have fictional elements added.