So it's revealed in Episode 3 of Lanterns that they gave John Stewart Senior the backstory from Frank Laminski - who is The Phantom Lantern a Green Lantern Villain.
Frank was chosen before Hal Simon Baz but admitted he was too afraid, then spent the rest of his life as a bitter Alcoholic before he was then given The Phantom Lantern Ring. He wasn't noticed and underappreciated and after being saved by Hal dedicated his life to becoming physically and emotionally stronger and fearless while others were chosen.
While John's Dad has the backstory, the show showed us that his Mother was a Racist and jumped headfirst into abusing her Child (and her other ones in a different way) because the Aliens who bribed her told her John might one day be a GL maybe if he doesn't have fear.
That all connects for a simple backstory of her becoming the Villain of Season 2. Although depending on what happens for the rest of Season 1 would dictate where her Villain arc goes.
Logically, John Snr should die due to the Aliens and Hal being unable to save him - probably having to make a choice and doesn't choose John Snr. Which furthers her resentment towards Lanterns and she may become a Proto-Black Hand instead of a Phantom Lantern.
That being said, the way she's set up now, she could easily fit into a Phantom Lantern role
What do you guys think?