There are 3 titles associated with this person.

@book{ wphp_6529
  author={Tonkin,Mary},
  year={1783},
  title={Facts. The Female Spy; or Mrs. Tonkin’s Account of Her Journey through France, in the War, at the Hazard of Her Life, at the Express Order of the Rt. Hon. Charles James Fox, Secretary of State; for Which She Has Been Refused Any Indemnity or Compensation.},
  publisher={},
  address={London},    }
@book{ wphp_6418
  author={Tonkin,Mary},
  year={1783},
  title={The Female Spy; or Mrs. Tonkin’s Account of Her Journey through France, at the Express Order of the Rt. Hon. Charles James Fox, Secretary of State.},
  publisher={},
  address={London},    }
@book{ wphp_6381
  author={Tonkin,Mary},
  year={1785},
  title={Facts dedicated to Her Majesty. The female spy; or Mrs. Tonkin's journey through France, in the late war, undertaken by the express order of the Rt. Hon. Charles James Fox, secretary of state, this pamphlet contains a particular narrative of the hardships, dangers, and distress, she met with, the various intelligence the furnished to government, the means by which it was obtained, and in what manner the escaped being taken. Not having received any compensation for her sercies [sic] from government-she submits her case to the candor and liberality of a generous public.},
  publisher={},
  address={London},    }