Help! Chicken making gurgling noises and can't move!

[socalchickens76]

My 4 year old barred rock is making gurgling noises and can't really move. She had a crop issue this last week that we thought we cleared up. Her comb is looking dark and her eyes are closed. What can we do to help her?

 

[socalchickens76]

Anyone have any thoughts? She can't even stand up anymore. The gurgling has gone away. Is this a crop issue?