She was born in Cambridge in 1892 to Major Sydney Edwin Bellingham and Helen Mary Dunlop.

The baby was adopted by a family friend, Major Ferdinand de Vere Beauclerk.

Beauclerk was educated in the Conservatoire de Paris and worked as a music teacher and piano accompanist until the start of the First World War when she returned to the United Kingdom.

She modelled for him and he illustrated two of her novels, The Green Lacquer Pavilion and The Love of the Foolish Angel.

Beauclerk wrote fantasy novels which leaned heavily on the tradition of French fantastic fiction.