[3] She was Lady of the Bedchamber to Catherine of Braganza, queen consort of King Charles II of England.

However, in 1678, her husband was one of the "Five Catholic Lords" who were falsely accused of treason in the Popish Plot fabricated by Titus Oates, and he was imprisoned in the Tower of London until 1684.

His wife's frantic efforts to secure his release led her into unwise dealings with such unsavoury underworld characters as the notorious informer and confidence trickster Thomas Dangerfield.

Fortunately, by the time they came to trial in the summer of 1680, Dangerfield's reputation had sunk so far that they were both easily acquitted.

James created him 1st Duke of Powis and 1st Marquess of Montgomery on 12 January 1689, in the Jacobite peerage.