While far from my favorite villain, I did like her incarnation mildly on the show. She makes a short appearance early on.
As we learn she had the curse that Regina casted after Regina traded it for the sleeping curse which failed to work on Snow White. She manages to get it back by force.
She spends most of her time as a dragon underneath Storybrooke. And Emma Swan fights her before breaking the curse herself.
She comes back later when all the bad people realize that finding The Author would make them have a good ending for a change.
I didn’t expect her story to turn rather sweet. She had a daughter named Lily, who like Emma Swan grew up on Earth and had no real idea of her origins.
They finally get a chance to reunite, and just like Snow White and Emma Swan, they have a imperfect but happy reunion. And her story mostly ends there.