I found a lot of info about Ann Dewar Davison after her arrival in Australia, her husband Jospeh( a true scoundrell), and her children.
Jospeh and his brother George migrated to Australia and stayed here, they are in fact the sons of William, their mother was Ann Duer/Duar/Dewar/Dewer (various spellings I have found).
Ann Davison nee Dewar, is most likely Susan Harris, who changed her name to avoid being found in Australia/England.
Susan and Joseph where on the run from the police in the UK
I have found no trace of an Ann Dewar in the UK which could be this woman.
It's a long and complicated story and as I do not know if there are any of her sons grandchildren are alive, i'd prefer to keep private for now.
Thanks all for the help, I would love to know though if anyone knows about her sons children and if they are still alive