That makes me think that she possibly had access to the records kept by the state of Illinois. I think your story would be of great interest to many in the fight for gun rights if it could prove that a national registry exists. That would be right up there with Fast and Furious type actions.
Maybe try contacting the NRA, and Second Amendment Foundation to give them all the details you have. I'm sure if you convince them of your experience they would be very interested!
Cheapshooter's rules of gun ownership #1: NEVER SELL OR TRADE ANYTHING!