To resurrect a very old thread, but I've found her!
I knew George Campion, son of Annie and Harry, eldest brother of my grandad died in Ludgershall, Wiltshire.  I since found out after Harry died, Annie went to live with George (grandad told me the other day).
I know Annie Badger called herself Polly Johnson on her marriage certificate.
So, once I found Annie died in Wiltshire I searched for her death. No deaths for Annie Campion, but there was one in 1963 for Mary J Campion.  A litle bell rang, weren't the names Ann and Mary fairly interchangeable?  I Googled that, and my search confirmed my thought.  It also suggested Polly and Mary could be swapped.  Thats 2 coincidences.
On the marriage certificate Polly's father was John Johnson.  
I checked the 1891 census for Mary. I found Mary J with a father called John.  Another coincidence?  
I ordered the death certificate.  It came today, Mary J Campion, widow of Harry Campion, death registered by George Campion.  It's her, I found her and I finally know her real name.  I feel quite teary. It's taken nearly 2 years to find this.