All these tough guys and white knights...so sad.
Personally, I think she's an asshole. Doesn't take mega-skills to roll up to a desensitized animal and pop 'em one in the head. So she did it with a bow and arrow. Big deal. Leaving it to suffer and bleed out overnight is a feather in her cap? It's fucked up. If she was any kind of hunter and not a simple killer, she would have offed it properly. So, people got to eat. I've a feeling they would have eaten anyway. And if they didn't, population control. Sounds like a weak excuse to cover up her need to kill something big with a bow and arrow.
So, we kill animals to avoid overpopulation and exhaustion of resources, yet we breed and consume with impunity. It's not like we're going to give up land/resources to replenish the animals and food supply and we won't be able to produce enough in continually limited space. Following this logic, the animal population will eventually perish until we're the only game in town.