While that may be true, she's already gotten used to gore just by living in Gensokyo and cutting apart eyeball things.
Honestly, there's not much more reason to spend time on this, we're nearly at endgame here. Let's continue while we still have momentum: cowering will just draw this out, and we can do that when we're less on a battle high. If you want to stop it, go ahead, otherwise:
> ... We can't do it. Cutting apart eyes is one thing... and even then, Rika and Sigma weren't really happy with us. Even if this kitsune is evil...
> Drop our katana on the grass. "Y-you... it's a-all your fault. Y-you and y-your..."
> Wait, she has a master, right? "L-lead me to y-your master! I'll m-m-make them a-apologize, t-too! I... I want t-to know wh-why..."