Grace was the daughter of Canon Marcon of Norwich. In August 1913 she was arrested and charged with obstruction during a scuffle in Whitehall between the police and a group of Suffragettes. This was led by Sylvia Pankhurst, following a demonstration organised by the Free Speech Defence Committee. Although found guilty, Grace did not receive a custodial sentence and was 'bound over' to keep the peace.
Rearrested in October, on a charge of obstruction and assault, Grace did on this occasion receive a sentence of two months in Holloway.
In May 1914, using the alias Frieda Graham, Grace was arrested for damaging five paintings at the National Gallery, including Giovanni Bellini's The Agony in The Garden and Gentile Bellini's Portrait of a Mathematician. Found guilty at trial, she was sentenced to six months' imprisonment.
Released on 5 June, delirious from her hunger strike, she cut off the long hair seen in her surveillance photograph.