The only way to discover if she was egg bound is to cut open her abdominal cavity and look.
However, when I've had a hen like this one, when I opened her up, I found a cavity full of infection and sometimes tumors. You would gain a lot of insight by mustering the courage to cut her open.
That's fine to give her. Also, give her a cup of water with one teaspoon sugar stirred in. This treats shock. There's no definite indication what's going on with your hen, but those are two good things to try.