We had the exact same thing last week, but our chick hatched was perfectly fine was even moved to the brooder, eating, drinking, livelly and then boom, and it was even more extreme than your picture and was most definitely intestines. Sadly, all you can do is euthanize. it is so hard for me to euthanzie but we are also a wildlife rescue and home to non releasable wildlife so we can usually give them to the raccoon or foxes and they take care of it quickly and as nature intended. So sorry, it really does stink, i know.