I am also trying to piece together my family tree. Robert Henry Kelly's eldest daughter was Eileen who was my mother but unfortunately she died when I was four and I was brought up by my father's family and had little contact with the Kelly side, so have very little to go on. Robert had at least two sisters one of whom is said to be Sally. I'm waiting for some information from England that may have some more details from an Aunt, but otherwise Have at present no further details. If I do acquire this information I will let you know. Perhaps I am also having trouble because he was orphaned like your Sally. Happy searching.
Regards Peter