Hi and welcome to RootsChat
If you just put the reference you have given (A/M/J 1901 Chipping Norton 3a/1885) into a search, without any name, it will show you the names of the people covered by this reference. In this case
Sarah Ann Hooper
Mary Tebby
James Aries
William Shelley
(you're lucky - sometimes you get an odd number of names if something has been mis-transcribed!)
So Sarah married either James Aries or William Shelley
From earlier censuses you can get Sarah's year and place of birth, so try and find her as either Aries or Shelley in the 1911 census, or a death registration after her marriage in 1901.
If this doesn't work look for Mary Aries/Shelley, so that you can eliminate one of the men
Unfortunately, for copyright reasons, we are not allowed to do 1911 searches on RootsChat.
Hope this helps

Linda