“If she is extradited, then *our* laws are not being faithfully executed.”
What exactly do you mean? In what way would an extradition be against US law?
In general, countries don't extradite to other countries when they themselves would not prosecute. An example of this is when other countries won't extradite murderers here unless we promise not to execute them. Another is when we don't extradite to, say, Saudi Arabia a woman wanted for driving a car illegally.
In this case, what Italy did amounted to double-jeopardy because she was first acquitted by a higher court, and then retried. Since that is technically illegal here, then we shouldn't send her to face punishment there. If Holder does anyway, that would be "not faithfully executing our laws."
There is a whole lot of fighting going on because a lot of people think she's guilty as heck, I understand that, but it's more important to me that we stick to the law.