Karen, I have information on the early court records for Nancy Leib, mother of Christian Leib, son of Christian (d-1830ish), grandson and heir of Christian Leib the elder (d-1847, 92+yo). Would have to check if Agnes Leib was married to Joseph or if she was Nancy Agnes Leib as you suggest. Nancy Leib died in 1837-8, have those records with Charles Myers appointed the minor child's guardian, I don't believe I have the specific info you seek but that shouldbe at the York Couty archives. Not sure if Nancy Leib was AKA Agnes Lieb, but the time frame for Nancy is possible (widow 1830-1838). What township was your McKinley from of York County?
Do you have any more info on her son Christian Leib? I was able to track him through ~1854, seem to have lost track of him in the area after 1855+, though I found another stash of paperwork, may have gone off to war and returned, a/o Kansas(?)... send me an email for follow up please.v/r John Stahl