I have a total blank on Ada Matilda Kelly - she was, in those days, classed as a mulatto (according to her marriage cert). I understand that she was some distant family to the Kelly family of Guyana - it is possible that she was adopted by them. She died in the 1950's -possibly before 1955. I knew her when I was a child and I recall that she had long dark hair.
Not much help, I am afraid