She wrote extensively, producing short stories and satirical sketches, as well as Land War fiction, travel writing, translations and literary criticism.

Her first novel, Through Troubled Waters (1885), was a fictionalised version of a real-life incident in Galway in which the daughters of a prosperous landowning family were murdered to make way for the sons to inherit the land.

Lynch responded by stating that she had intended the book for an Irish publisher and audience, and that she should not be asked “to prove my patriotism at the expense of truth”.

Lynch then returned to lecture in Ireland[4] and was a part of the Paris salons of the Belle Epoque as well as the Irish Literary Revival in Dublin.

She was friends with the historian, biographer and literary critic "Arvède Barine" (Louise-Cécile Vincens), the writers Mabel and Mary Robinson, and the medievalist Gaston Paris.