What Are the Names of the Parents of Elspien Machie

Elspien Machie is my 6th great grandmother and she married John Crosby and had my 5th great grandfather William Crosby. I dont have a lot of info on Elspien but according to Rootsweb.com she was born in 1736 in in Penpont,Dumfries,Scotland. Id like to know the names of her parents and if possible her grandparents.