Sorry--had another emergency come up but this time with a family member.
After further investigation this morning I believe it did drop into the abdomen
I don't worm with metronidizole. But in cases of anorexic birds with diarrhea, previous fecals have revealed giardia or other micro bugs that Metronidizole will solve. Then I follow up will 2 rounds of worming with safeguard or albendazole. My vet has suggested this as a gentler/safer way to de-parasitize a weak bird.
Although all of that is a moot point with the egg where it is now. I am back and forth to the hospital atm, but will have to deal with poor Piper sometime soon.