I don't have any personal experience with this, but from what I've read from others on here, it sounds like some form of bloat.
You could try taking the frog inside and placing it in a secure container with plenty of ventilation and lining the floor (and maybe the walls) with moist paper towels. Make sure you use dechlorinated water using drops that are used in fish tanks. Either that or spring water.
I'm not 100% sure what's wrong with the frog so I can't suggest a soaking solution, so for now just try soaking her for about 15 minutes in some warm dechlorinated water. If anything it should help her feel better.