I agree with buying a tub. An under the bed tub, maybe a smaller one assuming she will be small, with a locking lid, and a large heat mat is all you need. If you want the snake you should go over with a pillow case and take her with you when you leave. If you think she will turn you in for theft make sure you have all the correspondences stating that it was your snake and she was caring for it until you got back. Also take pictures of the condition it was in and the condition it is now.
I'm not so sure taking legal action would be a good route unless absolutely necessary, you may not get the snake back this way either. The authorities may see you as just as incompetent/responsible for leaving the snake in bad hands and not checking on its well being for 2 years. It's a bad situation, but in the end you did give the snake to them. They have every right under the law to keep it (at least in Iowa). I don't know every state's law, but in Iowa they made borrowing/loaning/caring a matter between you and the person. If you don't trust someone to borrow or care for something of yours you better not give it to them. The law says you willingly gave them that item and they can borrow it indefinitely. I'm assuming most states, if not all, have this law. The police don't have time to clean up poor judgment calls on friends.
Also in Iowa stealing your own item back is still theft. It sucks, but be aware of that. We had an issue with that in the family. The owner (our family member) stole his trailer back from the borrower, it was registered to him and everything, and the borrower turned him in for theft and he (the owner) was arrested.
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