Sounds like you’re in for quite the staggered hatch. Those generally don’t go well. You’ve got about 11 eggs that were laid by one or more hens getting into the broody nest in a span of two weeks. Those 11 eggs are all in different stages of development.
For now, I’d focus on the original 3 eggs. Broodies tend to leave the nest when the first chicks to hatch are getting more active, and in need of food and water. While one can’t say for sure, I’d expect the first broody to do the same.
This forum has taught me a lot of things, one of which is that candling under a broody hen is to be avoided. I feel like this is one of those instances where candling is unavoidable. Much like LaFleche has recommended, I’d give the more developed eggs (the first 3, especially) to the first broody, who has been sitting the longest. The less developed eggs can be given to the new broody.
Depending on how far apart those 11 eggs have been laid, you might still run into some problems. A reduced brooding period can be a problem for some hens, while others take to the chicks well. We don’t know how your broody will react. Most hens are ok with chicks by the second week, but the first week might be pushing it for some. You won’t know where your hen stands until the chicks hatch, unfortunately.
After candling, I’d mark each egg. That way, you’ll know which eggs have been brooded for long, and which are new. Seeing as you’ve got one more week until the first chicks hatch (and possibly more), whoever’s been adding to the nest will continue to do so. I’d remove the new eggs every day or so