There are 2 titles associated with this person.

@book{ wphp_6443
  author={Knott,Mary},
  year={1796},
  title={The last dying speeches, &c. of those inhuman murderers, Mary Knott, for the murder of a French emigrant nobleman, ... Richard Ludman, for the murder of George Hebner, ... and Eleanor Hughes who were executed this morning. With a copy of a letter sent by Richard Ludman, to his parents, the night before his execution.},
  publisher={s.n. [sine nomine]},
  address={London},    }
@book{ wphp_15005
  author={Knott,Mary},
  year={1836},
  title={Two Months at Kilkee, a Watering Place in the County of Clare, Near the Mouth of the Shannon, with an Account of a Voyage down that River from Limerick to Kilrush, and Sketches of Objects of Interest in the Neighbourhood, Which Will Serve as a Guide to the Coast Scenery. By Mary John Knott, with Engravings, &c..},
  publisher={William Curry Jun. and Co. \& Richard Moore Tims \& G. Ridings \& C. O'Brien \& Z.M. Ledger \& G. M'Kern \& Edmund Fry and Son \& Richard Groombridge \& Simpkin, Marshall and Co. \& George Davy \& Joseph Davenport \& Fraser and Co. \& },
  address={Dublin},    }