They call her an "Assassin" but not sure if this is really the fitting word for her.
She is a time travelling Fixer of things.
Things, that break history and future.
Without her, this today would not exist. Or it would, but maybe without humans existing on it.
The Ozon problem in the outer earth layers. She caused the fix to happen.
She prevented 34 atomic strikes. Which has been triggered by countries you are not even aware off.
The most crazy one was triggered, while the president of his country was cheating on his wife with the cleaning staff, and it got a bit wild. He sat on the red button after showing off the trigger device. Yeah thats us humans. We mess up and someone like her has to fix it.