I want one of my two mc's to have a sad, forlorn past. One mc has been forced to kill normal people who attack her under strained circumstances. Over 2 or 3 years she's killed several 'innocent' people who believe she is evil. She even contemplates letting herself die because she doesn't want to hurt anyone else. The problem is I'm not sure if this is too extreme. I want her to recover and let herself be happy after a while, but I'm not certain if that's realistic. Thoughts?