There are 2 titles associated with this person.

@book{ wphp_11601
  author={Stuart,Mary and Roberts,Mary},
  year={1822},
  title={The Royal Exile; or, Poetical Epistles of Mary, Queen of Scots, During Her Captivity in England: With Other Original Poems. By a Young Lady. Also, by her father, the Life of Queen Mary, &c. &c. In Two Volumes.},
  publisher={Longman, Hurst, Rees, Orme, and Brown \& John Taylor and James Augustus Hessey \& },
  address={London},    }
@book{ wphp_10799
  author={Roberts,Mary},
  year={1824},
  title={The wonders of the vegetable kingdom displayed in a series of letters. By the author of "Select female biography," "The conchologist's companion," and "Last moments of Christians and infidels."},
  publisher={G. and W. B. Whittaker},
  address={London},    }