Sarah was the daughter of Aaron Applegate (1768?-1848) and Mary Taylor (1768?-1840), who were among the earliest settlers of Forward Twp, Allegheny, PA and who are buried there in West Bend Cemetery.
Sarah married Daniel Yant (1802?-1866) about 1825. They had a farm in Carroll Twp, Washington, PA, where Sarah died in 1888. Daniel and Sarah had two children: James Harvey (1827-1888), who inherited the Carroll Twp farm, and Martha (1830-1911) who married John Stroud of East Pike Run Twp, Washington, PA.
Sarah Applegate Yant was my 3rd great-grandmother - I am descended through her son Harvey - and I have more info on this line if you want it.