I think you might have just startled her when you opened up the tank. They do that some time, start breathing really heavily when something big lingers over their house.![]()
Keep an eye (ear?) on it and if you notice it happening more often then see a vet. I don't think it is anything to worry about at this point though.
As for swallowing, sometimes I will have a couple friends over to watch the snakes eat and they will do exactly that. Then all my friends are bummed out because my snakes are so secretive. LOL