Hello, and to BP.net...

I suspect the bad sheds are the result of stress caused by:
1) being housed with another snake and the competition between them for the best spots.
2) Lack of security provided by the half log hides, and a fairly open and empty tank.
3) excessive soaking.

I do understand that since this snake is in a pet shop, you are somewhat limited to what you can use so the best I can suggest is try to replace the half log with some of the darker cave type hides, and maybe see about setting up a separate enclosure in the back to house the snake in once she goes opaque. Maybe being alone in a low traffic area for the shed will help. Good Luck...