I wonder if the following records might help you to decide, otherwise you may need to obtain death record.
Sarah was born 1906 in Nerquis or Nercwys, Flintshire North Wales to George Griffiths and Maria
On 1911 census age 5 at home one of 9 children
Alfred A Bower to Sarah Griffiths
Marriage 01/1932 Ticehurst Sussex
On the 1939 register with Alfred, Sarah DOB noted as 8 Feb 1906.
A tree and other records show one son born 1934 now deceased.
Death of Mother Sarah Griffiths(1906–1972)
28 Jun 1972 • Bromley, Greater London, England
Sarah Bower
Birth 08/02/1906
Death 04/1972 Bromley Greater London
Sarah Bower
Burial
Death 28 Jun 1972
Burial 5 Jul 1972
Lewisham, London,
Colin