You are doing just great! Don't worry - before you know it you'll have a beautiful, happy family poking around the yard!
Sorry if I misled you about the eggs - I only meant that one blueish egg looked a little off - the others look perfectly normal!
I probably would have left it in the nest, too, just to make sure, if it didn't smell too bad.
I think cocoa's advice about fencing her off from the rest of the flock would be a good idea, if you can figure out some way to do that. If you enclose off a small enough spot, it might also encourage her to stay near her nest if they don't all hatch at once.
Don't worry - it sounds like you're doing wonderfully!