We do tend to do tales of tragedy though. She was the victim on two different counts, as well as being the hero (recruited as a child soldier, and defending against hostile invasion. Heroic for shooting Nazis).

Depicting someone defending against the bad guys while being taken advantage of by the good guys and meanwhile shooting pedophile Nazis feels like a shoe in.

Also, it wasn’t technically a war crime at the time. The conventions around not using child soldiers are shockingly recent. Was still a bad thing to do, but only by modern standards.
We also tend to glorify war crime stories depressingly often, so I’m not sure that point even stands.