Two paths (attack on Titan Levi vs Eren fancfic)

This is the devastating story of Sadie Crystalheart. It seems as if everyone she loves and trust dies but she doesn't understand why. Left alone and almost insane she fends for herself fighting off insanity from seeing everyone of her friends being eaten by titans. That is until she unlocks a special ability and us locked into a cell with none only then Eren Jäger.