Just after my last message was posted the cow in question expired. I went out to check on her and she was dead. Her bowl movements and urination seemed normal. I'm at a loss as to what it could have been. I'm also kicking myself for not getting her to a vet, although like I said in previous posts, there were no signs of a problem other than being aloof from the other cows. She was always fat and in GREAT shape "maybe too fat", but to answer your question TCRanch, she was not holding her neck in any abnormal way. She had no swelling of any kind, I failed to get a temp.
Thanks for all the replys