How is your humidity? Chickie may be
stuck. If you want to give her a chance to live, poke a
hole in the fat end of the egg, where the air sac is so she can breath. She'll be running out of air
soon.
I generally hate to help a chick unless it's not hatching because of somthing - I - caused, because I don't want
to break an egg opened to find a deformed chick, who would have to be culled anyways. If she has been in there
3 days, she most likely has absorbed her yolk and what not, and is ready to come out. Heres a thread for helping
chicks out if you decide this is what you want to do. ~
https://www.backyardchickens.com/forum/viewtopic.php?id=491013
the part where it shows how to help the baby is closer to the bottom of the first post, so you'll
have to scroll down a bit. I must warn you that she still may not make it. I just zipped an egg for
two shrink wrapped chicks, and I still do not think they'll make it.
Good luck!