As with most large predators who have just finished digesting a juicy meal of human villagers, the Venus mantrap needs to eventually expel the waste products. The plant holding Elizabeth's both stretches and strains, and with a wet fart it shits Elizabeth's undignified remains onto the beach.
She is nothing more than plant shit now, her sloppy bones will be the only cairn to her existence.
The skeletons of her two daughters are crapped out beside her. They were all alone in their final horrifying moments, but now they will be reunited for all eternity.

Years later, most of their bones scattered by wind and tide, their three mortifying skulls, half buried in sand will be the only potential warning for future generations of naive villagers who wander this way. Most will ignore these signs until it is too late, like this young girl who has been hoisted high above them and is even now unawarely pissing on the bones of her maternal grandmother; literally dishonouring her ancestor. Elizabeth doesn't care about the flows of her granddaughter's stinking urine that run down her smooth white skull. Elizabeth, Cassie and Melissa have been dead for a long time. The dying girl above them begins to defecate with a wet plopping, and will all too soon join them in their open grave like the hundreds of heir ancestors before her.
This is the natural end for all people in the World of Bones.