Once again Rootschat has helped me find a missing piece of the jigsaw. Thank you SO much for your posting.
I have now located Rosina – indeed as you say registered as Rosia (I should have guessed, but my searches came up with nothing remotely like her name)
I now think she lived at 9 Gardners Cres, in the St Cuthberts Parish of Edinburgh.....but the writing is hard to decipher if you are not familiar with the locality. I am going to Edinburgh next week, so this has come just in time to help me look for where she lived.
Thank you so much,
Birdbrain.