Hmm, it's fairly common when breeding, even if you have everything perfect and your temps don't drop very low it still somehow happens. I'm not sure how common it is when you aren't breeding, if you have everything perfect. I'm guessing she just started the RI since you don't see much. Wheezing is a definite sign though. Do you know how cold your cool side gets? A good friend of mine got an RI at 75 degrees. It's not terribly low, but maybe if their immune system is already down for some reason, it's easy for them to get RI at that temp.