Sorry that it's taken so long for me to respond back; everything took much longer than I expected.
I don't like to disagree with fellow professionals, but it looks as if I may have to in this case, unfortunately, now that I've seen Dolly's test results although it doesn't give me any pleasure to say so:(
I tend to follow the guidelines as outlined by the International Renal Interest Society (IRIS) when staging my feline patients with respect to kidney disease. (http://www.iris-kidney.com/pdf/staging-of-ckd.pdf). According to these guidelines, Dolly is in Stage 2 Chronic Kidney Disease (CKD) although an SDMA test (not done for her) may modify this categorization a bit. For example, if she is very thin, then her creatinine value may actually be falsely reduced; in other words, in reality there may be more renal dysfunction than is suspected.
Treatment options depend on which stage the patient is in. Rather than list what those options might be, it will probably be much easier for you to access the following link so that you can peruse the information at your leisure: http://www.iris-kidney.com/pdf/treatment-recommendation-cats.pdf
Many cats in Stage 2 CKD often don't show many, if any, signs and they can remain in this stage for a fairly long period of time; however, the goal of treatment is to identify any possible other issues (such as Hypertension) and address them to reduce as much as possible progression of the disease.
In order to more accurately stage her which will then help to dictate treatment options, several additional tests need to be done:
1. An SMDA blood test.
2. Urinalysis with Urine protein/Creatinine ratio (aka UPC) if protein is present.
3. Blood pressure measurements although as I think I mentioned before, these are sometimes difficult to interpret
I strongly suspect that I've added to your anxiety level which I hope you know is the last thing I want to do; however, the way I see it is that it's best to face these things head on. Looks like your instincts may have been right after all.