Timeline:

Ages 0-14:

Went through the magic wardrobe with Emma. Was separated from Emma when Emma was adopted by the Swans. The two girls were occasionally in the same home but were apart more often than not. As they got older, the two began running away on their birthday and meeting up together.

At 14, Everleigh goes missing and Emma believes she is dead.

Ages 14-25:

Everleigh is in Neverland where Pan steals her magic. She stays physically 14 as she remains on the island for 11 years. When she would have been 25 Pan takes her memories and sends her back to her world because he knows he will need her to get Henry to the island.

Ages 25-28 (physically 14-17):

Everleigh has no recollection of her past before, during, or after Neverland. It is assumed she had amnesia and she is put back into the foster system. She bounces around from home to home until she finally, one year before she ages out of the system, finds a couple willing to adopt her in a town called Storybrooke.

Appearance:

Everleigh is practically the opposite of Emma. She has Snow's petite stature along with her dark, wild curls and porcelain skin. However, she has many of Charming's facial features including his chin and eyes.

Personality: Before Neverland, Everleigh was outgoing, energetic, and full of life. Her stay on Neverland hardened her which carried over after she left the island even though she doesn't remember her time there. Everleigh has a dry, sarcastic sense of humor and is a little rough around the edges.

How does Everleigh end up in Storybrooke?

In my story, Emma never owed Rumplestiltskin a favor. In order to get Emma to help him bring Neal to Storybrooke he reveals that Everleigh did not die like Emma had thought. He arranges for Snow and Charming to adopt her in return for Emma going with him to get Neal.

This story will mostly stick to the OUAT story line but there will be some changes. However, the timing will be different. For example, there will be a lengthy period of time between when Neal comes to Storybrooke and they all go to Neverland.