There are 3 titles associated with this person.

@book{ wphp_24486
  author={Seymour,Frances},
  year={1738},
  title={The story of Inkle and Yarrico. A most moving tale from the Spectator. Attempted in veres [sic] by the Right Hon. the Countess of ****},
  publisher={John Cooper},
  address={London},    }
@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},    }
@book{ wphp_831
  author={Fermor,Henrietta Louisa and Seymour,Frances},
  year={1805},
  title={Correspondence between Frances, Countess of Hartford and Henrietta Louisa, Countess of Pomfret, between the Years 1738 and 1741},
  publisher={Richard Phillips [6 Bridge Street]},
  address={London},    }