Hannah Sterry
born April 1795–February 1796
  in Longhope, Gloucestershire
died very roughly 1866

The identification here is a little more tentative than I would like, but I think sound enough. The chain of reasoning here is:

• we know the date and place of birth of the adult Solomon Hart
• there is an IGI christening record for a Solomon Hart which fits the date and place
• the parents of the infant Solomon Hart are John and Hannah
• two years earlier there is an IGI christening record (same parent names and place) for a John Sterry Hart
• Sterry looks like a surname, perhaps mother's maiden name
• there is a record of the marriage of a John Hart (of Blaisdon) and Hannah Sterry (of Longhope) in Longhope in 1816
• census records show a married Hannah Hart, born in Longhope
• Hannah's date of birth from the census records would be about 1795

The Sterry Worldwide site has a record of the baptism of a Hannah Sterrey in Longhope (All Saints) on 21 February 1796.

1841 census: living with children at Notwood, Blaisdon (no sign of husband). Age is 40–44.

1851 census: living with youngest son in Longhope (no sign of husband, but she is not described as a widow). Age is 55 and place of birth is Longhope.

1861 census: living with youngest son in Blaisdon (now described as a widow). Age is 65 and place of birth is Longhope.