Mama jumps off the cliff with just Lilly, and upon hitting the branch, Mama and Lilly turn into a shower of butterflies. The movie ends with Victoria realizing that one of the butterflies watching over her is in fact Lilly, perhaps referencing a ghostly regret of Victoria not going with her.
Five years later, a rescue party, sponsored by Jeffrey's identical twin brother Lucas, finds a now 8-year-old Victoria and 6-year-old Lily in the cabin, alive but in a feral state after years of isolation.