@pjofanficgirl so maybe loyalty or atychiphobia (fear of failure) or, my personal favorite, self sacrifice. which can be used multiple ways. so say her fatal flaw is self sacrifice meaning she would rather sacrififce herself and get hurt or possibly killed than see anyone she loves get hurt. or her fatal flaw could be guilt, which works in a similar way, she feels guilty for anything that happens to anyone around her so she takes the blow so none else gets hurt which would lead to her getting hurt too much.