>>715451954
She and her sister UMP40 got sent to a mission that went horribly wrong. As 45 was escaping, she ran into M16A1 who identified her as an enemy since 45 was unknowingly made a sleeper cell by the bad guys. M16 picked a fight with 45 to prevent her from escaping but the latter managed to get away with only a cut across her eye.
Despite how easy it’d be to fix it up, she decided to keep the scar as a sort of reminder of what happened and what’s important her. Her sister 9 later made a scar across her own eye intentionally to show her devotion to 45, but they wrote it out of her design in GFL2 for some reason