She was an active member of the Edinburgh branch of the Women's Social and Political Union (WSPU) and was arrested several times for her part in their protests in Scotland and London.

[3] Hudson was an active member of the Edinburgh branch of the Women's Social and Political Union and engaged in protests in Scotland and London.

[4] She was arrested for the first time in Edinburgh in December 1909 at a demonstration where Liberal MP Sir Edward Grey was delivering a speech.

Hudson addressed a large crowd before making her way to the theatre and becoming engaged in scuffles with police who were blocking the way.

[7] On 21 November 1911, Hudson was among the 223 protesters arrested at a WSPU demonstration at the House of Commons, to which she had travelled with other women from the Edinburgh branch, including Jessie C. Methven, Alice Shipley, Elizabeth and Agnes Thomson and Mrs N Grieve.

A fellow Scottish prisoner, Lilias Mitchell, described the forcible feeding of the hunger strikers as "a sort of hell for two hours" and reported that Hudson "fought splendidly - knocked down all the six wardresses & told the doctor what she thought of him!

[12] In May 1913 Hudson was charged with attempting to set fire to Kelso Racecourse stand, along with Arabella Scott and Elizabeth and Agnes Thomson, and, at Jedburgh Sheriff Court, was sentenced to nine months imprisonment in Calton Jail.