The first female to sit in the Lords was actually born in Greece, worked in India and was the widow of a Jewish Marquess.
She was born Stella Charnaud, later to be known as the Marchioness of Reading or Stella Isaacs (due to her marriage to Rufus Isaacs, first Marquess of Reading, from 1930 to his death in 1935) and eventually taking her seat in the Lords as Baroness Swanborough on 21 Octobner 1958. Her arrival was made possible under the terms of the 1958 Life Peerages Act. (Hereditary peeresses in their own right had to wait until the passing of the 1963 Peerage Act before they were allowed to take their seats.)
Baroness Swanborough was the founder of the Women’s Voluntary Service and a governor of the BBC. She died in 1971, but should be remembered for her ground-breaking arrival in the Lords 39 years after the first woman took her seat in the Commons.