Her mother and Zelena would know how to test her for that, probably, but Regina would have to do some research. For now, best for Arya to know, "You don't need magic to be special. It's what's in here--" She tapped her own chest over her heart and her temple. "--that makes a person who she is."

Tipping her hand to gesture for them to continue walking, Regina supplied, "All magic has a price, but the cost of that magic is small and worth the effort to make you laugh."