There are 3 titles associated with this person.

@book{ wphp_2282
  author={Knight,Henrietta},
  year={1775},
  title={Letters written by the late Right Honourable Lady Luxborough, to William Shenstone, Esq.},
  publisher={James Dodsley},
  address={London},    }
@book{ wphp_2296
  author={Knight,Henrietta},
  year={1776},
  title={Letters written by the late Right Honourable Lady Luxborough, to William Shenstone, Esq.},
  publisher={Caleb Jenkin [31 Dame Street]},
  address={Dublin},    }
@book{ wphp_13836
  author={Knight,Henrietta and Dodsley,Robert and Shenstone,William and Seymour,Frances},
  year={1778},
  title={Select letters between the late Duchess of Somerset, Lady Luxborough, Mr. Whistler, Miss Dolman, Mr. R. Dodsley, to William Shenstone, Esq. and others; including a sketch of the manners, laws, &c. of the Republic of Venice, and some poetical pieces; the whole now first published from original copies by Mr. Hull. In two volumes.},
  publisher={James Dodsley},
  address={London},    }