In 1871 old enough to be working as a servant at the Free Manse, Oyne
Elizabeth Davidson 46 Servant (Domestic) Peterhead, Aberdeenshire
Hellen Milne Servant 10 Message Girl Oyne, Aberdeenshire
Edit - the marriage of George Milne and Eliza Kemp at Oyne in 1861 is on Scotlands People
By 1901 it looks like Helen was living with brother John at 37, Sunnyside Road, Aberdeen,
John Milne 38 Mason Oyne, Aberdeenshire
Helen Milne Wife 36 Aberdeenshire
Helen Milne Sister 40 Retired House Keeper (Dom) Oyne, Aberdeenshire