Hi, What Time Frame are you researching ?
Best to start with most current information and work back
Where in USA did Sarah LEPRD nee CAMPBELL - settle.
If she is no longer living?
Registration of Death/ Long form Death Certficate may show the names of her parents including maiden name of the mother.
Where did Sara CAMPBELL and Abram LEPARD get married
Registration of marriage - will show names of both sets of parents including maiden name of the mothers
This information is more accurate than death reg - since information comes from bride and groom.
When? Where ? did Alexander CAMPBELL pass away?
Registration of Death should show name of spouse
OBITUARIES - may be helpful.