Immortality

Kylie Noelle Hayes, an impossible girl. She was born June 19, 1573. In 1600 her father and 15 of his best mates sailed off to the new world. They all had their wives and kids stay home, promising that they would come back for them. This expedition was never recorded in history because it was never officially scheduled. They had just went out on a whim hoping to survive. Little did they know, 27 year old Kylie had snuck onto the ship. Upon finding her, she was harshly scolded by her father. While he was yelling, a siren materialized out of the water. They were supposed to be a myth and Kylie simply couldn't believe her eyes. The siren killed all the men on the ship. Each one vanished with a poof, leaving behind only dust. Instead of doing the same to Kylie, the siren made her immortal. She could no longer age and each time she was injured she instantly healed. A while after, the ship crashed onto the shore of an uncharted island. 17 years later she was saved by a crew of fisherman who brought her back to England. Her story only got more complicated from there.
The year is now 2015. Kylie has a small group of friends that know about her immortality. One day an alien spaceship appears in the sky. She is then met with the one man who can save the earth. A man flying around time and space in a blue police box. She meets The Doctor.