Cats normally concentrate their urine. This is why they don't have to drink as much as humans- they take all the liquid out of the food and only pee a little because the healthy kidneys concentrate the urine. If the kidneys fail they lose this ability and then they pee more- and can easily get dehydrated. So Luna's phenomenon does not sound like kidney failure to me as she was not dehydrated.
I hope the girl gets better soon.
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