She did wrong, and did not admit it till the police caught her.
Then she got what she deserves... No less No more
If she was a FRIEND as you said then;
* She would not steel the CC in first.
* GIve it back directly when you started looking for it if it was a joke.
So this is a tough lesson for her...
The most you can do, so as to feel good inside is:
* drop the charges in the police station,
* Forget her...NO Matter what
* and most of all: get your money back ( which I daubt )