I think Jen has some good points, although I have to admit that I never noticed a difference in Tubby's intake and was completely taken off guard when they told me he was in the beginning stages of kidney failure. HOWEVER before that starts making you worried, Tubby is much much much older than Luna.
I don't think she'll have a problem, and if you have noticed a difference it's probably because the change of food like Jen said. However (again) we know you, and we know you won't be satisfied until you get the blood test and know for sure that she's ok. But since Luna is not easy to take blood from, I would ask your vet about it first. With all the things she's had going on, it's likely they've already taken a blood test and can tell from those results if she has a problem. Or he might just suggest that the next time she's in for something they'll do it instead of making a special trip.
Good luck and please let us know what you find out!
Tubby
Spring 1986 - Dec. 11, 2004
RIP Big Boy
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Peanut
Fall 1988 - Jan. 24, 2007
RIP Snotty Girl
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Robin
Fall 1997 - Oct. 6, 2012
RIP Sweet Monkeyhead Girl
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