Patroness (noun)

A woman who is a patron of a particular organization, art form, or cause.

Origin:

Late middle english, from latin patrōnus ("protector, patron") + -ess (femine suffix).

Examples:

1. The patroness of the local orphanage visited the children every week.
2. She became the patroness of the struggling artists, supporting their works.
3. The patroness of the school provided funds for its renovation.
4. Her philanthropy made her a much sought after patroness of several social causes.
5. The patroness was known for her lavish contributions to cultural institutions.