Springbonnie?

You're in Freddy's Pizzaria, sitting bored at your table, watching the animatronics perform their show. You feel like you're being watched, but you don't think much of it. You walk into a hallway where you're supposed to be allowed to go, but you're curious. It's quiet; you hear the children with the animatronics. Suddenly, you hear a door open and a yellow rabbit come out, and you immediately recognize it as Springbonnie from Fredbear's Diner.