I must agree with BillyBob_001 and Power. Simply believing that you found your DG is not enough. You are tricking yourself. It is ok if you trick yourself, but you shouldnt make newbies trick themselves as their LDs are rare.

You want to believe that the DG that you have created/found knows more about you than your own consciousness. This is pretty easy to test - ask her questions, disregard the feeling of wisdom and analyze what you've heard. That is provided you can remember everything that she said... If you find an ounce of BS, she's fake.

DGs are rare, there's no reason for them to manifest themselves until the time has come. DCs on the other hand are abundant and are known to lie/deceive/BS nonstop. Especially if you would ask them such leading questions as "Are you my DG?"