The Buffy and Angel Trivia Guide // How I got there

In Smashed, Amy and Willow have the following conversation:

Willow: “Don’t you want to go see your dad?”
Amy: “No. Can’t. Not yet. Too many questions.”
Willow: “About where you were?”
Amy: “No, about how I got there.”

This is a reference to The Witch, in which Amy went to live with her father after her mother’s life was taken over by dark magics. Obviously her father would not be happy with Amy practicing magics!