Wendy: here are my thoughts.
Under the staging system, she would be in IRIS Stage 2. I'll try to break it down a bit.
Hydration: typically you would wait until her creatinine approaches 300 to give fluids. You probably already do this but I'd get as much water as possible in her food. It's best to get fluids from drinking or food for as long as possible.
Azotemia: the elevated BUN and creatinine sometimes can be addressed with Azodyl. I never had any luck with it but I've heard others say it helped with the values and still others say it didn't change the values but the kitty felt better and ate better. You could discuss it with your vet. It's basically a probiotic specifically designed for CKD cats. It can be expensive. I do think her creatinine is elevated but you aren't at the "take action now" point.
Phosphorus: it's higher than it should be for her age. It shouldn't be any higher than 1.45 but if you can get it down to 1.5, that would be good. I've found that P can vary but hers has been in the same ballpark lately so I'd try to get the P level down in her food. At 1.9, you need binders so I'd try to do it via food by feeding lower P raw foods. Because P control is really critical, if you can't find lower P raw foods, you might have to make it. I have a recipe from Dr. P for lower P raw food. Let me know if you want it.
Potassium: It is unusual for a diabetic cat to have higher K+ levels because insulin causes the cells to uptake K+. But ace inhibitors like benazepril can cause increased K+ values. I'd just ask my vet if she thinks that might be why you'd see the elevated K+ although she's been hovering on the higher end for a while.
Bicarbonate: has me stumped. over 50% of CKD cats develop metabolic acidosis because the bicarbonate levels are too low and it changes the blood pH (becomes acidic). I haven't seen a cat with high bicarbonate values and I'm not sure what that means. Your vet should.
Osmolality reflects the concentration of the blood and can be high because of an issue with ADH (anti diuretic hormone) which can be associated with diabetes. Or it can just be due to dehydration. I'd discuss further with my vet.
HCT: she's not showing any anemia at all which is great. You need to take action when it gets to 30%.
USG: pretty dilute but since it was at the end of the day, it's hard to say if it's accurate especially if she's drinking more. You'd need the first sample of the day.
I'm glad her UPC is better although I didn't see it but they may record it differently?
I hope this helps. I'd focus on helping her with hydration, decreasing P, and maybe adding Azodyl or trying it....or ask around FDMB for opinions. And I'd definitely ask about the K+ and bicarbonate.
I'd also have the c&s done but sometimes infection doesn't show up on those labs and an u/s is needed. One step at a time though.
I hope this is helpful.
She's a little quiet due to high numbers, resting on her memory foam bed. I'll get b/w results later today. 
, and just heard from the vet. She's not alarmed and is suggesting urine culture as one possibility (Neko has never tested positive for UTI) or U/S of kidneys. I've created a new labs tab on the SS. Neko tried to lighten my mood by playing with her felt ball again just now. Any feedback on the labs appreciated.
