Rainbow Dash was curious about the Crystal Mirror. She went through it and firstly noticed she didn't have hooves or her wings...she wasn't a pony. She had hands. She was a human. She seen it was night and saw vehicles, lights and stuff she noticed you and went to talk to you.

Rainbow Dash: "Hey! I'm uhhh. New to this place. Can you explain where I am? Please? I really need to know. Also is it okay if we can talk for a bit?"