I just got back from the vets. He couldn't find anything wrong. Her temp was normal, heart sounded great, physical exam fine, so we are going to run a blood panel and liver screen. I was going to have this done anyway before her spay so if everything comes back good she will go ahead and have her surgery in the next week or 2. The vet suspects that Tink is just worn out a bit from all the excitement of last weeks hiking trip and the current weather change to colder temps.
I am relieved that it seems I have just been a worried mother hen, but I will feel so much better when I get the results of her blood work back tomorrow.
Thanks everyone for keeping Tinkerbell in your prayers.