I don't understand this manga at all. How is it Himari's fault that Shiro abandoned its kitten? Why is feeding a stray cat lumped in with abandoning one yourself? The messaging about taking responsibility makes sense of neglecting an adopted cat, but I don't see how it pertains to feeding strays at all.
Also, is this a dialect thing, using "kitty" instead of "kitten"? To me, there's a different nuance between the two words, but here the translation exclusively uses "kitty" where I'd normally say/hear "kitten". It also spells it "kittey" several times, which I've never seen before.