Definition of "grandaughter"

Certainly Mrs. Churchill's plan, for her grandaughter to look the best, was any thing but efficacious, in the first instance; for Ethel sank back, pale, and almost fainting.

1837, L[etitia] E[lizabeth] L[andon], “Unavailing Regret”, in Ethel Churchill: Or, The Two Brides. […], volume II, London: Henry Colburn, […], page 107