That definitely seems odd. While not expert enough to say what the problem may be, I can suggest Betadine soaks in the interim. They seem to be the RES equivalent of Chicken Soup. They can't hurt, but they certainly can help. My vet has suggested them for everything from shell-rot to general bacterial prevention. Not sure if you are familiar with them or not, so forgive me if I am telling you something you already know:
Straight off my vets notes: "place in a supervised warm soak with very dilute Betadine. The Betadine should be diluted to the color of very weak tea. Use a soft bristled toothbrush to gently clean the shell. Rinse well after 10 minutes."
The water only needs to be deep enough to cover the shell, so since the visit will be so short term a small container will do. I usually have a container with clear water next to it for rinsing.
Soak, brush, rinse...
Don't be surprised if the little one gets persnickety and clamors to get away. It may look sad, but if you have him/her in shallow water where all they have to do is lift their head to breathe, are using a soft brush and not forcing their head under water, they will live.
Just like children, sometimes they just have to go through things they don't like. Give a few pellets afterwards for positive reinforcement. Soon enough they will be a little less dramatic 'cuz they'll know food is on the horizon
