In 1911 Gibb refused to partake in the
census, along with her mother and the rest of the family. In March 1914 Gibb was found guilty of striking a constable outside Holloway prison with a dog whip and sentenced to two months in Holloway. After
Emmeline Pankhurst's re-arrest in 1914, Gibb entered the
National Portrait Gallery and slashed the portrait of one of gallery's founders,
Thomas Carlyle by
John Everett Millais. She was sentenced to six months imprisonment. During the reporting of this arrest, she is referred to as Ann Hunt, which she used as an alias. The portrait only went back on display a century later. Following this attack security for women entering the National Portrait Gallery was tightened She was one of a number of suffragettes photographed when
Scotland Yard commissioned the undercover photography of militant suffragettes from 1913. The images were used to identify suffragettes attempting to enter public buildings such as museums and art galleries, where they might attempt to damage the objects. == Family and life ==