Yes, probably and it may turn out to be right - or perhaps Thomas and Eliz Ball took in Susannah as a child and brought her up, but she wasn't their granddaughter!
When I looked for the baptism I came across a John Jones, son of (apparently single) Susannah Jones bap in 1819 (might have been 1820?!) at Great Witley - I wondered if this mum was sister to Mary Jones and they both had illegitimate children (as in my tree it does seem to run in families!!) - Then Mary would have been naming her child for her sister! Probably all just coincidences given that Jones is a common name. In any case, John Jones appears 1841-1881 and has a wife, Hannah, but never helpfully shows up with an ageing mother, Susannah, with an age and birth place to enable us to see if she ever had a sister Mary! lol I suppose mose people had a sister called Mary in those days though
