Hoare was born on 7 July 1777 in Old Broad Street in the parish of St Peter le Poer, London to Samuel and Sarah (née Gurney) Hoare.
In 1831 she wrote and illustrated Poems on Conchology and Botany. Hoare's book is an early Example of a female Victorian author using observations and scientifically based research to inform her writing. Hoare's poems are a rare Example of a collection based on conchology. It has been argued that Hoare and her contemporaries were influenced by the writings of Erasmus Darwin and in particular by his poem The Loves of Plants.
Hoare was the daughter of Samuel Hoare Jr and wrote a memoir of his life that was posthumously published in 1911.