The Guardians A Stormy Flight

Greyla Leaf is a normal 12 year old girl, beside the fact she is a Garlen ( A winged human) and despite there being attacks and deaths around the world everyday she is used to it and Greyla lives a normal life.
But then one day the bloodshed finally finds her quiet village. Poor Greyla saw her mother die, and get separated from her brother. She managed to find her little sister Mabel and the two barley escaped death. Soon after Greyla found an all women Organisation called: The Flight Of Arrows, and soon Greyla was training to be a strong huntress.
But once again (at age 13 this time) Greylas life turned upside down, when a dying prophet stumbles into their camp and sputters out their dying words minutes later, a prophecy: A Girl with wings as white as snow, but eyes as dark as storm. She & 2, of Storm,Moon, Earth. Shall fly to the mountain casted in snow&stone.
But in the end she must fly alone.
Soon after she is sended on a quest to find these "2." But on this perilous quest, she is faced with decisions of loyalty, prison, and near death experience but most importantly: Flying Alone.