set some food and water close to her nest. if you've got a rooster, I would give her 4 eggs, to account for unfertilised or unviable birds. if it's a good hatch you might even get all four!
hmm.... she only pooed after you took hr from the nest.... was it large? was it normal bird crap consistency? have you gotten her xrayed? she sounds broody. if you are that worried, take her in for a scan.