Hoping today is a good day for you and Abby!!
Yes the Bun was up, but that could be partially due to dehydration. The Creatinine is important, probably a little more so, and that was up just a little. She may have just needed fluids and meds for her GI stuff. Unfortunately because of her kidneys, what would be a minor intestinal flare up in a dog with normal kidneys, may be worse for Abby because of the dehydration affecting her faster and more severely.