The brick wall strikes again

Elizabeth Bowler is not a blood relative but the 2nd wife of my great grandfather Joseph Bell (1883-1950) and the only grandmother my dad knew, his maternal grandmother dying in 1909.
Elizabeth first appears on my radar when she married Joseph in 1918 in Congleton although the family actually lived in Salford.
Further investigation has found that Elizabeth also appears on Josephs army form, Descriptive Form of Enlistment, this form is not dated but contains a statement 'home 5/1/1917'
Elizabeth is listed on the 1921 census living with Joseph in Salford and again on the 1939 register living in Oldham.
Joseph appears on the 1911 working on a canal boat in Cheshire so it appears he met Elizabeth sometime between 1911 and 1917.
I also have Elizabeth listed in the 1911 census as married and living in Fleetwood, her married name being Bowler, the big issue here is I have no idea what her birth surname is but census records list her place of birth as Ambleside, Westmorland.
Joseph Died in 1950 in Hulme Manchester but the GRO record is detailed as Salford, a newspaper obituary infers that Elizabeth is still alive
Any help pushing this forward would be gratefully appreciated.