I have a Sarah Coolican Kearney, b. abt.1845 Carbondale, PA. The family is located in Archbald by the time of the 1860 census. She married a KEARNEY, I have no other info on her marriage. She is listed in the will of her father, Patrick Coolican, who died 1883 at Archbald.
It is interesting that you mention a g-aunt, Bridget Kearney. Sarah had a sister named Bridget, wondering if perhaps she named a daughter after her sister. Just a thought. Do you know the parent's names for your Bridget Kearney Malarkey?