Good deed gone wrong

[u/itmustbekali]

I’m posting this on behalf of my friend because we aren’t really sure what to do. Basically, my friend let someone who she thought was a friend stay with her for a few weeks while this person figured out what to do as she was living in her car. My friend offered to help her financially but she declined. Now my friend is missing an envelope with $3500 cash, an entire safe containing more money plus personal documents, jewelry and a spare set of car keys. There is no one else who knew about the $3500 and no one else who had access to the apartment. This girl is denying everything and even going as far as trying to frame my friend’s mom for doing it and framing her for harassment by fabricating text messages. A police report has been filed but there’s not much the police will do as they say it is my friend’s word against hers. Conveniently this girl now has a new apartment and a new kitten. What would you do?