Found your post today, but could not tell if you had found the information you were looking for. The only Abigail Shingledecker I could find was in the 1860 Census, Pennsylvamia, Fulton Co.,Licking Creek Twp. She was 39 years old, Servant. Living with Isaac, 55 years old, Mary 76 years old, Martin, 45 years old, Martha, 34 years old. Could not find any of the family in the 1870 Census.
Found Wyatt Underwood 1880 Widowed, living with another family listed as Uncle.