Quote: This was very long ago and I wasn't experienced enough to diagnose her if she truly was internally laying however I have learned how to diagnose them now for the most part by other clues. I did not have her put down and I really should have back then. I do put them down now if I suspect internal laying, ascites or any other illness I know I can't treat. I tried to treat this hen with the hard abdomen on my own and still she passed. I know better now.
As for your girl it is your choice and you know your hen better than anyone else. I now have a rule that if I have tried everything I can and a long period of time (days or weeks depending on the bird and it's illness) has gone by with no improvement or they have gone down hill, I put them down now. I don't want them to suffer and if I can't fix them, nor a vet, there is no sense in watching them go down hill and suffer out the death.
Now that I have had more experience with internal layers and ascites, I don't think you can drain a hard abdomen. Water on the belly is so liquidy that it is easy to poke a hole and get the draining started. Being hard, I doubt anything is going to come out. The source of this may be above the intestines and the intestines themselves are pushing down on the skin making it hard and tight. I really doubt anything will come out. With my birds, I learned how to find the pockets of liquid by the color of the skin on the abdomen and was able to start the draining in these areas. Fluid build up areas appeared yellow on the skin of the belly.
You could try antibiotics?? Amoxicillin is wonderful for E.coli associated with oviduct infections and internal laying. It penetrates much better than PenG injections and is preferred for internal laying. It's just an idea.