Hi Carl - yep, true I'm afraid. Once the eggs started to form in earnest, I took her to the vet for a course of 10 calcium injections in 10 days. She's not been in good health for a couple of years now and occasionally displays signs of calcium deficiency - we're thinking there's probably some sort of age-related metabolism problem underlying this. Anyway, she's reacted very well to calcium shots in the past, so we decided to boost her up a bit.
The last few visits have been since the prolapse. Once to have the prolapse replaced, three more visits for calcium shots and the last checkup to confirm that there was a stricture at the top of the prolapse.
The vet wouldn't keep her in just for the shots, which are a 10 second job. The last few days back in her viv have been to give her some peace and quiet in a familiar environment to see if we really have to intervene.
As for cost - well, I guess it's immaterial. However, luckily my vet is nuts about snakes and I've been charged around 45 pounds sterling for all his work so far.
Anyway, still no joy and she's back for a stay this afternoon. The vet is hoping to lightly sedate her and get her muscles to relax so that he can manipulate the remaining eggs out. It's unlikely that he'll be able to aspirate, as she's produced slugs and they'll be pretty solid by now. It may mean surgery, but we both hope to avoid that with such a doddery old lady.