Apocalypse Mom's Revenge Stash

Jenna Reed's newborn was swapped by her husband and his mistress; she was abandoned to death in the Apocalypse. Reborn, she swapped her child back. She pretends to get along with her ex-husband to defraud his money, stockpiles supplies, and builds an Apocalypse shelter. When the Apocalypse arrives, her ex-husband and group try to kidnap the child for extortion, unaware it's their illegitimate son. Villains get their just deserts; she lives peacefully with her son.