Milne's concern over the wages and conditions for women and her own experiences of working 14–16 hours a day lead her to becoming a founding member of the Women Worker's Trades Union along with
Augusta Zadow and
Mary Lee in 1889. She was also heavily involved in the pursuit of
women's suffrage. Milne differed from both Zadow and Lee in that she was a working woman with grass roots involvement in the clothing trade. In that same year she gave evidence at the Commission of Enquiry into Shops and Factories. Milne spoke of long working days as a cutter, and impressed on the Commission that fatigue and exhaustion were common among clothing trade workers. ==Role as inspector of factories==