a soldier's mindset

Harriet Potter disappeared and no one can find her. Until the triwizard tournament, that is. However, Harriet is different from what they expected. Broken and now named Rose, she is now a soldier, but for who? Mentions of torture and death. Fem!harry, cause I can. May turn into a crossover. I didn't know which genre fit this story, so they may change as the story progresses.