It appears that Hannah wasn't keen on revealing her actual age to the Census takers...
In 1841 Hannah Priddy, aged 25, was living in Hart Farm, Wootton Bassett. Present were [nephews] John Hoystop (16), farmer, and Thomas Hoystop (11).
In 1851 Hannah Priddy, aged 45, born in Wootton Bassett, unmarried, farmer of 120 acres employing 4 labourers, was living in Hart Farm, Wootton Bassett. With her was nephew Thomas Hoystrop (19) of Southampton Hants, assistant servant.
In 1861 Hannah Priddy, aged 45, born in Wootton Bassett, unmarried, farmer of 140 acres employing 4 labourers, was living in The Hart, Wootton Bassett. With her was nephew Thomas Hoystrop (27) of Southampton, farm bailiff.
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Hannah Priddy of Wootton Bassett died aged 70 years (burial record).
Orthographic variation: PRIDDY