I don't understand. Why did Ran make more food? Excess of housework to relieve her stress? Reward for Chen's success?

... or to make sure Chen wasn't hungry so she didn't have to hunt such terrible things? Aside from the part where I think I've heard that doesn't have much effect on cats' hunting ability/drive... <_<

E-mouse said:
... or to make sure Chen wasn't hungry so she didn't have to hunt such terrible things?

That would be it, according to artist's comments on the pixiv page.

Didn't work on my cat... She would still eat spiders and whatever else she found around the house that she deemed edible. She was particularly fond of spiders, though.