I checked my resources too and was able to find only her marriage record (if I found the correct one) and death record on the www.novascotiagenealogy.com
site. That is if she married Joseph Muirhead. As the death record in 1909 indicates she was 45 then her year of birth would pre-date those birth registrations on-line at this site. I also checked census records and the only one I could find for a John McDonald household in Whycocomagh in 1881 did not have a Kate listed as the wife but rather an Ann, but the Flora was 15 so about the correct age. Other siblings were John, Angus, Lachlin, Donald, Johnny, and Annie. Is any of this of any help?