Okay, I’m not sure about this idea, but here goes. I’m thinking along the lines of It’s a Wonderful Life. Your character is so overwhelmed and frantic with life that she/he wants to go to the Mirror City. The Reflector surprisingly agrees to take her on the condition that she stay in the building that connects the two cities. She discovers that she is able to see into the other city. As she watches the city, she sees the consequences for her actions unfold.
I hope this helps. 🙂