I read this entire post, and i can honestly say that this is insanity. This "Casey" person stole a "Valuble" mouse and is now lying about it? Big surprise, i dont know too many honest people these days, that is the real sad part about this. I completely understand the OPs frustration and feeling of betrayal from this LITTLE situation. But at the same time, i personally do not think that pursuing this person in court or on the street will solve much. That would be more of a hassle then what you have already gone through with this person. If i were you i would just chalk this one up in the Loss column and move on. Forget about it and move on with your original plans without her. Im pretty sure that she does not care how resentful you are towards her, when she got the mouse. It is absolutely sickening she would do this to begin with i know, stupid human behavior. I think you can settle down nicely now, knowing that her reputation is pretty much trash at this point and you will not ever have to deal with her in the future.