Ryker wanted the surviving infant in order to get hold of her dead family's money to which she is the only heir. Eventually, Sarah takes Molly to Emma, her mother, and asks Emma to care for Molly, knowing to keep them safe she can never contact them.
Five years later, Sarah fears that Molly's safety is at risk due to Shaw's machinations, and she confronts and kills Ryker before reuniting with her mother and Molly. Emma introduces Molly to Sarah as her sister.
Molly does not appear in any further episodes, nor is she mentioned again.