A kind mother, the opossum took Ellie, a baby Mammoth in even though the girl was vastly different from their family. Since Opossums are marsupials, she presumaby carried her children in her pouches, as mother marsupials do this until their children have grown big enough. Crash and Eddie 's mother is believed to have died at some point of old age. Eddie seems to have her brown eyes, and even Crash has a flat nose like her, so both twins have each inherited a different trait from their mother. She was presumably the one who taught Crash, Eddie and Ellie to hang upside down from a tree, and taught Ellie to behave like a possum. It is unknown about her husband, Crash and Eddie's father.
She made a brief appearance in a flashback when Ellie remembered she was caught in the middle of a blizzard and was found by a mother opossums who had just had two babies:Crash and Eddie.