Sierra Gets Forgotten

Hi, I'm currently developing this idea as a television series, and I decided to write a script for a pilot.

ACTUAL DESCRIPTION: In the far future, Earth's resources have been depleted, and all of humankind are relocating to Mars, including 13 year old Sierra and her family. Everyone is about to leave on spaceships, and the ship that Sierra and her family are riding is the last one to leave. With all their stuff packed into magical bottomless bags, they depart for the launch area. However, on they way to their destination, Sierra gets lost in the woods, but her family doesn't notice, and think she has boarded. When Sierra finally makes it to the launch area, she finds that the ship is already taking off. She realizes that she is now stuck on Earth indefinitely. She contacts her parents, and they freak out once they realize Sierra is trapped on Earth. They consult the President, he says there is nothing they can do for now, as they used the last of the materials required, and it will take a while for the materials to reproduce, so that they can send another ship. Sierra's parents tell her that she'll just have to stay on Earth for a while, and encourage her to explore the Earth and record her findings, to study how the Earth has changed since the humans left. In Episode/Chapter 2, "Sierra and Scout", Sierra finds a talking dog named Scout, who also got lost while everyone was boarding the ships and was forgotten, and she adopts him.