[1] Garnett was brought up by her paternal grandparents, educated at a convent school,[4] and later worked for some time as a pupil-teacher.

[5] In April 1909, she sparked some interest by running about with a whistle before chaining herself, along with four other activists, including Bertha Quinn, Margery Humes and Sylvia Russell to one of the male dignitaries' statues[6] in the Central Lobby of the Houses of Parliament to protest against a law forbidding precisely this kind of thing - disorderly conduct within the Palace of Westminster when the Parliament was in session.

In June 1909, Garnett and Lillian Dove Willcox were arrested during another attempt to "rush" the House of Commons and convicted of assaulting a warder whilst in Holloway Prison and were given another ten-day sentence.

Garnett planted a Taxus baccata Elegantissima, and a lead plaque was installed to record the event.

[8] The following week, on 14 November 1909,[3] Garnett assaulted Winston Churchill at the Bristol Temple Meads railway station with a dogwhip, cutting him in the face.

[10] She remained favourable to the feminist movement,[10] joined the Six Point Group[1] alongside suffragette Charlotte Marsh who later left her a bequest.