If she's back on the nest by now, you don't have a problem. If she is not and the other broody's can cover them, move them. If they were started at the same time, you don't have a problem.
If they were started at different times and you can move them to the other broody's, mark them before you move them so you know which is which. Then, if another hen goes broody before they hatch, give these eggs to her. An incubator is also an option if you have one.
Some hens are better brooders than others. Lollipop is right. If she quits, never trust her again. If you are raising replacements and she is not a good brooder, I'd cull her so her traits are not incorporated into your flock.
Good luck.