There are 2 titles associated with this person.

@book{ wphp_1573
  author={Smyth,Agnes},
  year={1783},
  title={The religion of the heart, delineated in a series of letters, written by Mrs. Agnes Smyth.},
  publisher={},
  address={London},    }
@book{ wphp_1563
  author={Smyth,Agnes},
  year={1790},
  title={An extract of the life, death, and spiritual experience, of Mrs. Agnes Smyth, whose spirit returned unto God who gave it, on the 22d of May 1783, in the 28th year of her Age},
  publisher={},
  address={London},    }