Shelly is home, safe and sound. A huge weight has been lifted off my shoulders. She made it about a half mile down the road and has been on a porch since about noon today! Thank you everybody for all the exposure given here and all the comments to help point me in the right direction. Also shout out to the Oak Park Neighborhood Association page on Facebook!

For everyone's safety, meet in a public place and never send money to strangers to recover a pet. Verify anyone who claims a pet before arranging a meeting.