Yes, I understand. I don't know which reading is 65, however: BUN? Creatinine?
Vomiting is common with kidney failure.
It helps to know the results of a urinalysis when a dog has kidney failure; there are things we can learn about the kidneys from urine that we don't know from blood tests. It would help me to know her BUN, phosphorus, creatinine, potassium, red blood cell count, and a urinalysis.
There are many causes of kidney failure: toxins (grapes, raisins, antifreeze, certain mushrooms), infection, autoimmune disease.
There are also two basic forms of kidney failure: acute and chronic. With acute kidney failure, the treatment is "diuresis"; giving IV fluids around the clock for 2 to 3 days, and then repeating the blood tests to see if she is getting better and kidney function is improving.
With chronic kidney disease, the treatment is also fluids, injections to stop the vomiting, and other medications. Acute kidney failure can sometimes be reversed and the kidney function can improve; with chronic kidney disease, you can only manage the symptoms but not improve kidney function.
Is she getting fluids? Do you have the results of the blood test or know which blood test is 65?