She was bound to the system to travel through time. The system issued a mission asking her to poison her aunt's mother and murder her aunt's sister. She refused to listen and was eventually wiped out. When she was about to die, the system she was bound to was changed. She learned from the new system that the previous system had been wiped out for violating the regulations of the Space-Time Administration. The new system sent her back to modern times...
Intention: Never forget the original intention