Back from the vet. $520! Ouch. But worth it. They did a fecal direct, float and gram stain, plus a CBC plus an avian/reptile profile. All negative except this muscle value, which indicates white muscle disease. She said it could happen from trauma. We did hear a kerfuffle in their enclosure prior to finding her like that. Maybe she had some sort of scare.
They tube fed her and gave her shots of vitamins. They also gave me a tube and syringe showed me how to do tube feed. I'm hoping her appetite will be stimulated and I won't have to do it!
So now we wait and watch. Everyone send good thoughts to Coco! Thank you for all your help and concern.