Magic mirror in an abandoned barn in the Dwarf Forests. Goldilocks finds it when she hides there from soldiers of the Corner Kingdom. It's most likely a communication mirror, though its exact function isn't described.
"It was slightly tilted and had cracks on the bottom half, but she could still see her reflection perfectly."
The mirror is mentioned in The Wishing Spell.
When Goldilocks tries on a dress she found in the barn and looks at her reflection in the mirror, the Evil Queen suddenly speaks to her. The Evil Queen is the only one who can communicate from mirror to mirror.
It is unclear if the barn, the dress and the mirror are a set-up from the Evil Queen (Goldilocks has used the barn as a hideout before), or if she just noticed someone was standing in front of a magic mirror she had access to.
- ↑ TLOS I, ch 17, p. 333