If the Cochin hasn’t hatched yet I would help her out. She may need extra assistance if she makes it. I’ve had some start the process and not make it due to shipped egg issues. Sometimes they get turned around and stuck so help after this long is needed. Peel shell away, not membrane so you can ensure there are no blood vessels in the membranes. If they look clear, you can then peel away some membrane as well. Yay for the others!!
I too will pray for those little call duck eggs and for your friend. Loss like that is so hard no matter what!
Edit to add - in cases where they seem to be dealing with a drying out membrane you can rub the membrane with a bit of Vaseline. Helps a lot!