The Earth In Gray

A handful of teenagers had to flee Greylios, their home planet, to escape annihilation from a hostile alien race. They fled to Earth to await their return home.
Russia Grave was born on Earth but never felt like it was home. She grew up hearing of Greylios and dreamed of her people's return home. She started to hate humans and had mixed feelings about planet Earth itself.
Russia's attitude will have to drastically change if she wants the gray race to survive.