Then the eggs have started the hatch process and you should not touch them. Move her back on them, do not move them to her.
4 hours is nothing. They should all still hatch - if they are under the hen when they open up. Edited to add, this is assuming you haven't already picked them all up and turned them over checking temperature etc. in which case, who knows? But it is still worth trying to set her back on them. She may even be able to hear them cheeping inside the shell.
