Hi Cran
Welcome to RootsChat

Possibility Maggie's surname may have been WARK rather than WARD? There is this possible entry in 1881:
William Wark 25, coal miner b. Old Monkland, Lanarkshire
Marion Wark 23 b. Coylton, Ayrshire
Margaret S Wark 2 b. Coylton, Ayrshire
Christine W Wark 9 Months b. Coylton, Ayrshire
Address: Lorne Row, Coylton Ayrshire
The best place to confirm Maggie's parents would be from her marriage entry to William Pollock. This is available to view on the official pay to view site
www.scotlandspeople.gov.uk - costs are reasonable. Have you tried searching for the marriage? I can see a likely entry for a William Pollock and a Margaret Sloan WARK in 1900 in Ayrshire.
Monica