i finally decided to get our girl off her "dud" eggs but she would not move, so i reached under her to find a cracked empty eggshell
...and i hear peeping! she didn't leave her nest at all yesterday, and she hasn't been off yet today (she usually gets off at least once a day for about 10 minutes to eat, drink, stretch and bathe). i've given her food and she's eating while sitting on her chicks. my question, when would you estimate that she will get up and move around, how many days usually does mom stay on her new hatchlings?