What Can I Do (Thieving Grandma)?

Recently, I noticed that my wallet was missing. I didn't drop or lose it, it just simply disappeared. And I know who was behind it - my grandmother.

It's tax time & she wants the money for a bigger apartment, so she stole my wallet (which had my ID & SS in it) so she could file me on her taxes & get a bigger return. I had intended to file myself, but she wanted to beat me to the punch.

I don't too much care about my return (wouldn't be worth much anyway), but my debit card & all my cash were also in there. Until she decides to give it back, I'm flat broke! Well, that's IF she gives it back; the kind of person she is, it's also likely she'll just pocket my cash & throw the rest away.

The worst part of it is, even though I know she has it, I can't call her on it. We're living in her apartment, so if I even thought about trying to confront her all she has to do is threaten to throw us out. And I don't exactly where she has it hidden: the mass of stuff she's got in her room, her car, or any one of her many purses.

I just want my money back, and I'm not certain it'll still be there by the time it resurfaces. What can I even begin to do?