It may not necessarily be hardened eggs you are feeling it could also be tumors. Either way, when hens get into this situation there is little hope. We've gone through this several times over the years and I've gotten to the point that when I see these symptoms I put the bird down or have it euthanized. They do suffer a lot with this regardless of the cause and by the time they are showing such outward signs they are very sick and uncomfortable. They really are tough birds and the end does not come easily or quickly for them. That said, depending on the actual cause of this for your bird, EYP vs some kind of tumor or other disease, antibiotic's and removing fluid can help but it's very temporary, it does not solve the underlying cause and before long you are right back where you started.