Tough call. Eggbound females are 50/50, for either condition add epsom salt to the water, 1 teaspoon per 10 gallons, increase by a teaspoon daily for a maximum of 3 teaspoons per 10 gallons. This will often relieve constipation, and sometimes induce spawning. If she is eating, but has abnormal stringyish feces it probably is constipation, a tiny bit of epsom salt sprinkled on some frozen brine shrimp will help with this issue.
If she has normal feces, good chance she is eggbound. The only real hope for this is to fast completely for 4 weeks, in the hopes that this extended starvation will cause the eggs to be absorbed back into the body. If this is the case, and she makes it, her breeding days are over.
It could also be a cyst or tumor. I've encountered this as well, there is a medication called Clout that can be helpful with this. This is similar to cysts or tumors in dogs, in that even if you solve the first one it tends to be a recurring problem.