Could be a number of things, so here's what I would do.
Get her into a lukewarm bath - that may help her relax, it's good for circulation, the moist air may help her breathing, and you can see how she moves, if she moves.
For example, when Romy was having a hard time passing the remainder of a soft egg, I put her in the tub. She just floated there, hardly moving. And hour later, she was paddling gently and began to pass the membrane. She paddled just a little bit, and uttered a few little chirps. Within another hour she had passed the membrane, eaten some peas, and was talking very loudly, and swim-pacing the tub. She had recovered.
I would also get some apple cider vinegar (unpasteurized is best) into her water, a tablespoon per half gallon to start with. I would keep her quarantined, as jdywntr suggested.
If you have poultry vitamins with electrolytes and probiotics, give those to her once or twice a week.
One guess I have is that she is either just stressed, or has had a little bug that she was fighting off and the stress of moving overwhelmed her system.
So, rest, a relatively warm and definitely safe place, extra vitamins and electrolytes (the acv helps with electrolytes), and watch.