Hi
@nancyrat
I'm sorry your hen is not well too. The fullness hanging between the legs is often ascites (water belly)..... does it feel like it may be fluid like a water balloon? Ascites is actually just a symptom rather than an ailment in itself and often stems from a serious reproductive disorder like internal laying, but can also be caused by other things like liver and heart problems. Unfortunately these are all mostly terminal but if it is ascites, fluid can be drained off to give almost immediate relief from the worst of the symptoms. It would be difficult to say from a description or computer screen photo if it is ascites and or what is causing it..... if your hen has not laid for many weeks or months even and is not desperately old then internal laying is a likely cause. It is a very common reproductive disorder.
I will attach a You Tube video link which explains and demonstrates really well about how to drain the fluid from a hen with Ascites. It may give you the confidence to try this yourself if veterinary treatment is not possible....
You should be aware that your hen's condition is most likely terminal and that there are risks with trying to drain her but it could well extend her life and comfort for several weeks or months, so may well be worth it if she is a pet.
Good luck with her and let us know how you get on.