Williamina H Thomson, birth, Premnay 1880.
Margaret Thomson, mother Ann Thomson, father not named, birth Premnay 10 April 1864.
1871 Census, Premnay: Ann Thomson, 30, unmarried, pauper and stocking knitter, born Premnay; Maggie Mitchell, daughter, 6 and Mary Emslie, daughter, 4.
Mary Thomson, mother Ann Thomson, father not named, birth Premnay 10 June 1866.
There's also a Margaret Ann Emslie, parents William Emslie and Ann Thomson, born Tarland and Migvie 5 April 1868, who might be worth investigating. This couple, however, were married in Tarland and Migvie on 8 June 1867, so it may be a coincidence of names.
1851 Census, Premnay: William Thompson, mason, 48, born Inverurie; wife Margaret, 46, born Oyne; Helen, 18; John, 16; Ann, 20; Margaret, 8; Mary, 3; all children born Premnay. Looks like the family of William Thomson and Margaret Leslie, married 28 January 1832 at Oyne.
Margaret Leslie or Thomson, mother's surname Benzie, died in Premnay in 1869 aged 64.