If it won't eat and it's shell is soft, it isn't getting adequate heat and light. It requires UVA and UVB light to digest food. It must bask in the light and be completely out of water in order to dry its shell so it doesn't get soft. If you don't get it the proper heat and light soon, it will die. They can't survive for long without proper heating and lighting.
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Soft-Shell is a common disease, and is caused by a lack of adequate light and/or Vitamin D.
As far as lack of light goes, sometimes taking away and glass or perspects between the light and the turtles is a goood idea as it can filter out the UV.
Hope this helps :)
Courtenay
Uh, well gee...I believe if my turtle was HALF DEAD, I would TAKE IT TO THE VET IMMEDIATELY before it's ALL DEAD!