Hi Rosie & Kay,
Thank you for your prompt replies. I think you are correct & I have my generations muddled. Sarah is in fact Elizabeth's mother. I have found them on the 1871 census at Dewchurch, Hereford. Elizabeth is married to Henry Francis Froggatt (march qtr 1856 Hereford- freebmd) & Sarah is living with them & named as mother-in-law, also living with the family is *Charles Joseph Vaughan aged 19 (born 24/9/1852 Upper Bullington, Hereford) nephew I think Sarah born 1824-1829 married Joseph Vaughan March qtr 1851 Hereford. I haven't been able to find Joseph & Sarah Vaughan on the census after their marriage. *Charles Joseph Vaughan is their son & in 1861 aged 9 was living at Dewchurch, Hereford & described as a stepson, but I haven't established yet who he was living with.