IMO if it was eggs that she did not passed she would probably be dead already, when animals remain egg bound for two long they basically go septic, that's why egg binding is something serious and that need to be addressed ASAP if it happened, so I would likely ruled that out too. Than again sometimes weird things happen.
I agree that getting a picture of the soft tissue which cannot show on X-Ray would help, you could be looking as a cyst (+ abscess if caseous pus is present), or tumor.
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