In 1904, she aided him in the Cairo Working that led to the reception of The Book of the Law, on which Crowley based much of his philosophy and religion, Thelema.
The eldest of three children – her siblings being Eleanor Constance Mary and Gerald Festus – the family moved to the Camberwell vicarage in 1880.
In 1895, Kelly escorted her brother Gerald to Cape Town, South Africa, where he convalesced from a liver ailment during the winter of 1895–96.
[5] Following this, at her direction, on three successive days beginning 8 April 1904, he entered his room and starting at noon, and for exactly one hour, wrote down what he claimed he heard dictated from a shadowy presence behind him who identified himself as Aiwass.
"[6] Kelly had two daughters with Crowley: Nuit Ma Ahathoor Hecate Sappho Jezebel Lilith (1904–06) and Lola Zaza (1907–90).