She was made president of the Society, which grew in power and influence until its membership reached 1,000, and took an active part in its work, also writing tracts and pamphlets in its interest.
In 1901, Milne was appointed Parliamentary superintendent of the BWTA's, Scottish Christian Union (SCU) for Scotland, which office she still held in 1928.
She was also a member of the executive of the Scottish Temperance Alliance, and addressed meetings throughout England, Scotland, and Ireland.
[1] Representing Scotland, she served on the General Council and the executive committee of the World League Against Alcoholism.
She was the leader in organizing a great National Memorial with a quarter of a million signatures, asking the Prime Minister and the Government to prohibit the liquor traffic during the period of the War and six months thereafter, and she was one of the members of the committee that presented it to the Prime Minister, through the Secretary for Scotland.