Smith was born in the village of
Bratton, Wiltshire, the daughter of William and Sarah Prior (or Pryor). Her father, who died in 1830, was a successful
yeoman farmer, while her mother was a prominent member of the local
Particular Baptist sect. In May 1831, she married an agricultural labourer, Philip Smith, who had a reputation as a drunkard. Their first child, Jane, was born the following year. Ten others followed, none of whom lived more than a few months. In 1846, following her mother's death, Smith inherited £100 () and moved the family to
Westbury. Her husband squandered the inheritance, forcing her to find seasonal work as a crop-picker and vegetable grower; consequently, the family lived in "a visible state of poverty and ill health". ==Discovery==