She may have botulism, may have ingested some kind of toxin. She may be egg bound.
Is she passing anything? Eating anything? Any guesses how much bread?
Is she drinking?
Can you get her into a tub of lukewarm water deep enough to float in? Can she then manage to stay upright?
Get her separated, with plenty of fresh drinking water with activated charcoal, about 3 capsules per pint of water. Not charcoal briquettes for cooking, use activated food grade charcoal. It absorbs toxins.
Please keep us posted.
If egg bound, the swim in warm water may help her pass it.
If toxins, you will probably very soon want to give her Epsom salts or molasses in water.