Maddie Ehret was the daughter of the superhero, Jackpot. After her father was killed and her mother was attacked in front of her by the villain, Boomerang, she was sent to stay at the Baxter Building while her mother sought revenge. She later moved with her mother to California and her name was changed to Sydney Jobson to protect her identity.
Her mother was exposed to a virus that gave her superpowers while she was four months pregnant with Sydney. It remains to be seen if Sydney has any abilities of her own.