Hi All
There are 12 entries for the births of Ann* Murphy in Scotland in 1928. Unlike the English BMD indexes, no quarters given on Scotlands People for entries to help you narrow down results, nor for births do mothers' maiden names show.
As suggested, a request for a search would be the best option (otherwise it is £10 per order of an extract if you do it on line on
www.scotlandspeople.gov.uk) You have key data, birth date (although always good to add a couple of years either way) and father's name, which will all help on the searches.
When you do find the right entry for Anne, it should include a date and place for parents' marriage which will help you in working back

Monica