Do with the diet as you may.

If you're suspicious of kidney disease, these kitties need to be put on a low protein diet, as high protein diets make the kidneys work harder and can exasperate the condition. And she may drink a lot and you offer her canned food but any kitty with suspected kidney or UTI issues can never have enough water intake!!!

Of course, I recommend against self-medicating her unless you're a DVM and can make a proper diagnosis as if you aren't using the proper medication you could potentially doing more harm than good...

I do hope you're able to take her this weekend!