Seeking some advice over this relative:
The 1911 census shows her as Nora Eunice Campin, born 1907 Bicester, parents Arthur John Campin and Eunice Annie.
The only marriage record I can find is for a Eunice N Campin Q4 1928 St Giles London to George W Parkinson, this looks probably the right one for her if consider a switch of first name used.
The only death record I can find is for a Eunice Nora Parkinson Q4 1975 Surrey which looks probable particularly with a date of birth stated as 18/12/1906 which agrees with 1907 estimate.
It would be OK to reason that she went by first name Eunice second name Nora, contrary to the earlier census records? If so then this all makes sense.