Is Bayley still eating with gusto? What are you feeding her? Have you tried switching foods? "Senior" formulations tend to be lower in protein and fat than what older dogs actually need, so be careful with those. Look for something with easily digested ingredients (no barley, corn, millet, soy) and a good level of protein. I'd also suggest adding canned food and/or something with more moisture to her diet. If she's well-hydrated, then her kidneys won't have to work quite as hard.
You might also consider adding a digestive enzyme product like Wobenzyme or Prozyme since they will help her get the nutrition out of whatever food you choose to feed.
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