Lilly is shown to be extremely resourceful and a severely adept Survivor, having survived almost a decade into the apocalypse by her own hand. During the events of Season Four, Lilly grew into a ruthless and violent sociopath, likely due to the fact that she lost her father (her only family) and former allies, forfeiting any reason to keep her humanity. Lilly's hostile nature is shown when she manipulated Minerva into killing her twin sister when they tried to escape, when she cuts out Louis' tongue due to him talking too much (Determinant) and orders another child's finger cut off for the same punishment, and when she stabs James in the back after promising to leave Clementine and the kids alone in exchange for sparing her life. (Determinant) Furthermore, in "Suffer The Children", she threatened Clementine to convince all the children at the school join the Delta, or she would force them to join regardless.