I'm kind of old school in my thinking. I would just jump the gun on her and talk to the cops. Tell them that its your cat but she took it to the vet and listed herself as the primary owner because you weren't there at the time. Just be honest.
If this doesn't work, you will have to use your personality to create some fear within her. Just act like you could snap at any time. Refer to Dion Phaneuf or Clint Eastwood (Gran Torino) for how to do this.
Hopefully she doesnt have a key to your place either.......
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