I agree that it was likely gas in her stomach. This can cause very severe symptoms similar to gi stasis(lack of appetite, hypothermia, increased respiratory and heart rate, lethargy and other signs of pain), but can have a quicker recovery rate, and may even seem miraculous with how instantaneous it can seem. It can seem like they may be dying and seconds later seem perfectly fine.
If you feel the upper abdomen when it's happening, you can feel the bloated stomach ballooning out just below the ribcage. A bloated stomach can cause a rabbit severe distress and pain because the gas can't escape, so it builds and puts pressure on the stomach and surrounding organs, compressing the heart and lungs causing circulatory problems and breathing difficulty. Because of this, it can sometimes lead to heart or respiratory failure, or a ruptured stomach from the excess gas. But sometimes if the stomach exit isn't completely blocked and the gas doesn't continue to increase, in time the gas can pass to the intestines, relieving the pressure and a lot of the distress. In a matter of seconds or minutes, they can go from looking like they are on deaths door to seeming almost completely better.
I know because I just went through this a few weeks ago. My rabbit was in severe distress despite even having had a high dose of buprenorphine. I could feel the bloated stomach and she was trembling and grinding her teeth. I was on the verge of taking her to the emergency vet to have her stomach decompressed to relieve the pressure, but right before I had just given her a max dose of simethicone(gas relief med). Within half hour of giving it she completely changed and started eating and acting completely normal. I could also start to hear the stomach contents starting to move through the digestion. I kept an eye on her for the next few hours and she was fine after that. Her condition had been worsening all day, so I'm fairly certain her recovery can be directly attributed to the gas relief med. Never seen such a marked result after using it before. It's astounding how something as simple as gas pain can be such a severe illness when it comes to rabbits. Definitely a serious problem, and quite common with how often I seem to have to deal with it in my own rabbits, though usually it's just a mild case and resolves in a couple hours.
Bloat is one reason why it is so important not to be syringing fluid/food into a rabbit that has stopped eating, until you know exactly what you are dealing with. In a case of stomach bloat, this will just add more pressure and gas to the stomach making the situation much worse.
Oh and yes, she IS adorable! :inlove:
