Jen founded the registered charity Women in Jazz in 1986, continuing to add to her collection of oral histories, jazz sheet music, books, artefacts and records.
Sefydlodd Jen yr elusen gofrestredig Women in Jazz ym 1986, gan barhau i ychwanegu ei chasgliad o hanesion llafar, cerddoriaeth ddalen, llyfrau, arteffactau a chofnodion jazz.