Need some serious help.

[Sasha2]

I was given a ball python today.I gave this to my friend in October when I bought my pair. They are all siblings.
So mine are fat, healthy and big.
This one I was given looks like it did when I gave it to her but skinnier.It has horrible stuck shed, maybe looks to be two sheds in one.Its obviously dehydrated too.
She said it only ate three times since she had it.She tried dead, live, rats and mice.She tried putting it back in the bin I gave her with the snake from the 40 gal tank she was keeping it in.

So now its mine..I am not sure how to proceed.
Should I soak it or just put wet paper towels in a bin over night?
Do I wait till the shed comes off to feed it, I dont imagine it will eat in the condition its in anyway.It looks just horrible, I knew it wasnt eating properly and had given some advice, the usual stuff.I had no idea it was this bad.
I hope it wont resort to force feeding but am prepared to try this before I give up.