She should consider herself damn lucky that the Federation no longer has a death penalty.
Although I admit I wouldn't exactly lose any sleep if her people's actions were construed as war crimes (which they certainly could be) and she was treated accordingly. Especially since one of the Voyager crew DIED because of them.
Does the 24th century Federation have the death penalty for war crimes, though? Even in today's world, there is a growing number of countries that have outlawed the death penalty under all possible circumstances (including war crimes).