Before trans: I'm guessing G-chan is telling her big sister about her day, but G-nee isn't really listening, just thinks her little sister is cute?

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Coga said:

Before trans: I'm guessing G-chan is telling her big sister about her day, but G-nee isn't really listening, just thinks her little sister is cute?

Not quite, I think its more like G-nee made a big-sisterly conclusion about G-chan's feelings toward humans.
By the way, thanks for concluding the left figure is G-buri's big sister. I was initially confused by this comic (thinking the right figure was Cricket-chan returned), but that makes the most sense. While G-nee looks mostly like G-buri, her bow is a different pattern we haven't seen before.

(G-buri's exasperated expression in the last panel looks a lot like Cricket-chan's common expression, but Cricket-chan's bow has an ornament we don't see here.)