Hi Jess, I hope your Shelob is still hanging in there. Its normal for backbulbs to get a little wrinkly as they age, but if all the pseudobulbs are wrinkled then I would guess it is not getting enough water. This could be because it wasn't being watered enough, but most times the real culprit is root rot. I would check the health of the roots and cut way any rotting bits. Hopefully your new medium will give this plant an opportunity to recover, good luck!