Does it look red and/or irritated? Does it look crusty? Can you see pus? (yuck - I hate that word!)
Take a Q-tip, moisten it with warm water, making sure it is almost dry - then gently poke the pouch back in place. Chances are she has been doing a some aggressive grooming. Keep an eye on her - if she continues to show interest in her pouch or you find it out again, a vet check is in order.
Please keep us informed. We worry about these little guys.