Scribonia died as an adult (as opposed to elder), unlike many 'ancestral' Sims, and is buried in the cemetery at the Capp Manor. She and her husband both died due to old age, although they were adults. There is a second thumbnail of Scribonia showing her as an elder hidden in the game files. It can be found with SimPE. Oddly, she has a memory of the death of an unknown Sim.