Thanks for the kind words everyone. I think I might have figured out the mystery. I was out there under my deck again tonight pondering what the heck happened and I see a HUGE slug!!! When I finally did open Flash's mouth there was some mucous in it. She couldn't have gagged it up if her airway was blocked! So I think she ate a slug and it got stuck from all that sticky mucous junk. It would figure that I didn't feel it as slugs are soft. No matter what I couldn't have done anything to save her so I just have to realize at least she had a good life and that she wasn't in a factory farm wasting away.