She is the main character of the anime Soukou no Strain!
Sara Werec is an orphan who lost her parent and was taken care of by her brother Ralph who was a hero for the Union. Sara was given musical pendant by her brother before he left for a mission and promised to return for her. For years she trained to be "Reasoners" just like her brother. However, one day the Deague attack and was lead by non other than Ralph himself, who killed Sara friend, teachers, destroy her school, mimic and almost kill her too. Shocked by her brother betrayal and suffering post-traumatic stress disorder Sara cut her hair, change her name into Sara Cruz and transfer to another academy, training as a "Gambee" pilot (a smaller, less maneuverable mecha), as she can no longer pilot a strain, in order to be in the front line to find the truth behind her brother betrayal. While there she had endure the bullying from the bitter and confused Gambee pilots like Isabella.