@casportpony is right that Ethel is severely underweight; she only weighs approximately 1/2 of what she ideally should. Not only was she by your estimation too weak/unable to move/eat/drink for approx. 4 days, but something caused her to get in that state in the first place.
Do you have any idea how old she is? I have had many hens of her "breed". They are very strong and healthy up to about 3 years of age and lay eggs nearly every day. But eventually the high lay rate takes its toll and they succumb to reproductive problems. If Ethel is 2 years old or less, she is hopefully physically young and strong enough to recover from this ordeal. (But that also partly depends on if she has had adequate care up to this point.) There have been many incredible survivor stories on this forum, and while all of us hope Ethel gains membership to that group, only you are there to determine if she wants you to help her fight to survive, or if there comes a point she needs you to help her go. Chickens are no different from dogs in that way. They let us know.
Do you have any idea how old she is? I have had many hens of her "breed". They are very strong and healthy up to about 3 years of age and lay eggs nearly every day. But eventually the high lay rate takes its toll and they succumb to reproductive problems. If Ethel is 2 years old or less, she is hopefully physically young and strong enough to recover from this ordeal. (But that also partly depends on if she has had adequate care up to this point.) There have been many incredible survivor stories on this forum, and while all of us hope Ethel gains membership to that group, only you are there to determine if she wants you to help her fight to survive, or if there comes a point she needs you to help her go. Chickens are no different from dogs in that way. They let us know.