Hermit crab does naked run

One of our hermit crabs, Jessica, is naked at present.

Hermit crabs live in borrowed shells. When they grow too big for their current shell they find another and change. However, one of ours is sitting around naked at present - a bad sign! It can be a sign that they are unwell or dying. But there isn't much we can do. We've put Jessica in isolation (a yoghurt container) with a number of possible shells. Now it is up to her, but as you can see in the photo I've just taken, she's sulking in the (bottom right) corner.