Missy322 - In reply to your statement --> I just worry that she is suffering and we dont know.
I guess dogs are like people... They have good days and bad days. The criteria I would use is that if her tail is still wagging & she's glad to see you, then she is probably not suffering. Uncomfortable maybe but not suffering.
I knew my dog had taken a turn for the worst when he would yelp when I picked him up. Also, he would stand perfectly still and seem to be staring at something but his eyes didn't seem to be focused.