Born Isabelle Marie Françoise Corr in either Dublin or Brussels, she studied art as a child.
As well as portraiture, she painted religious and historical scenes such as Our Lady Appearing to the Oppressed, which hangs in the Church of the Holy Family in Schaerbeek.
She worked on commissions for the Belgian royal family, including several portraits of Queen Louise-Marie.
On her death in 1883, the Royal Library of Belgium purchased a large collection of her works.
Media related to Fanny Geefs at Wikimedia Commons This article about a Belgian painter is a stub.