We do, however, need to give some weight to honoring of extridition laws, I suppose. Otherwise, any mafioso hitman could just run to Italy for protection.
But, I do think it's more about politics than justice. It's also about the ego of an undefeated prosecutor getting his cherry popped for the first time. I think she was tried in a kangaroo court.
All that being said, here's my take on it. I think she should voluntarily submit to a, legally non-binding, polygraph test. She should be asked 2 questions and 2 questions only.
1. Did you kill the person?
2. Were you part of a conspiracy to kill the person?
If her answers are "no," to both questions and she passes the test, she should be protected by the full weight of the US government and even the military if need be.
If she answers yes to either question, she's on her own.
If she refuses the test, she's on her own.