No obvious OPR birth/baptism entry found and no OPR marriage in Scotland in Scotlands People. Not in 1841 census. Therefore parents' names from children's death certificates and birth year estimated by subtracting the age of consent at the time from the birth date of the (as far as I know) oldest son, Donald.
Sources
Death Certificate of Son Donald
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DNA Connections
It may be possible to confirm family relationships with Isabella by comparing test results with other carriers of her mitochondrial DNA.
However, there are no known mtDNA test-takers in her direct maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Isabella: