I don't think she started out as one. It's just that losing all her friends so quickly caused her to close off her heart and turned her into a hard ass after hearing the baby cry. So she doesn't want to see anyone near her die off like that again but at the same time she's unsure how far she should go to push someone as talented as Yuuya. After all he has no real fighting experience and initially he's very reckless/rude which means his chances of dying are quite high if she doesn't be hard on him for his own good.
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