There is a Louisa Ellen Phillipson, wife of Eric Phillipson, in Newport, Monmouthshire, on the 1911 census, age 34, born Stony Stratford:
https://www.ancestry.co.uk/imageview...ce&pId=3053768
Married 2 1/2 years, no children, so I assume she is the Louisa Clarke who married in 1908 in Newport, Mon. There is a Louisa Ann Clarke birth registered Jan-Mar 1875 Pottersbury; I suppose she could have changed her middle name and knocked a couple of years off her age.