haig and her sister, evelyn, started a local branch of the wspu in edinburgh, but she then left for london. haig was met by a young grace roe when suffragettes were chalking the pavement in kensington high street. haig invited roe to the demonstration at hyde park and she went and was inspired by christabel pankhurst. haig was in the delegation with emmeline pankhurst, including jessie stephenson, maud joachim and mary philips, when mrs pankhurst was attempting unsuccessfully to see the prime minister. a year after the women's parliament she was involved with the audacious "pantechnicon raid". this was where a furniture van (pantechnicon) was used as a "trojan horse" to get twenty suffragettes to the house of commons. when they were close, haig, maria brackenbury, georgina brackenbury joined the rest who tried to rush their way into the lobby. haig was arrested together with the brackenburys. they received six-week sentences.