We've just come across your message and are very interested in it. We are descendents of John Aird and Barbara Stewart Aird nee Thomson via their son William Downie Aird born 1878, Edinburgh. He also came down from Edinburgh to London, where he met our Great Grandmother Minnie Hatch. They ended up in Grimsby where our Dad was born.
We have Isabella on the 1891 census living 30 Park Road, London, previous entry to that for Joseph and Elizabeth Webster who were at 31 Park Road. We've got more information going back for her if you are interested but we have been unable to locate anything after the 1891 census so are very interested in what you've said!