I See the Light, Fading Away

This story is about a woman named Alexis who has a disease. This disease and unknown to any scientists ;therefore, there is no cure to it. The only people who knew the disease any how it starts, was her parents, who both got killed in a car wreak. The lone, independent woman has to figure out what her disease is, how is starts, and how to stop it before anything happens to her or anyone else.