There is a Joseph Clarke buried there in 1906 - would this be her husband?
Other Clarke burials in Maisemore that I've been advised are all earlier:
Ellen Clarke of Maisemore – August 30, 1833 aged 4 years
William Clarke of Maisemore – May 30, 1834 aged 82 years
Charlotte Clarke of Maisemore – January 22, 1855 aged 79 years
Anne Clarke of Maisemore – December 4, 1856 aged 79 years
Mary Ann Clarke of Maisemore – January 21, 1859 aged 1 month
Thomas Clarke of Maisemore – December 5, 1867 aged 63
Catherine Clarke of Maisemore – December 16, 1880 aged 34
John Clarke of Maisemore – February 18, 1884 aged 84
Jane Clarke of Maisemore – December 17, 1884 aged 77
John George Clarke of Maisemore – December 18, 1891 aged 48
Hannah Clarke of Maisemore – November 14, 1896 aged 84
Joseph Clarke of Maisemore – July 28, 1906 aged 64
... and other information suggests there were two Clarke families around during the latter 19C. So if John George Clarke was the father of Joseph Clerk and his wife was Ann, might his sister or sister-in-law been Emma?
The 1851 Census I'm advised lists:
Charlotte Clarke – widow – head of household - aged 73 – on Parish relief – born Tuffley
John Clarke – head of household – married – aged 51 – Blacksmith – born Gloucester St Mary de Lode (this effectively is the church of baptism not the actual birthplace)
Ann Clarke – wife – aged 44
Jane Clarke – daughter – aged 12 – born Maisemore
Joseph Clarke – son – aged 8 – born Maisemore
Ellen Clarke – daughter – aged 6 – born Maisemore
John George Clarke – aged 1 – born Maisemore
... so John George Clarke didn't have a sister called Emma, but did have a brother Joseph Clarke - who might have married an Emma? And then she subsequently moved in with her nephew in 1906 when her husband died?
So that agrees with Halhawk's deduction...