It Wanted To Go With You

A scene from when Pathfinder sought Fortuna's help at her shop...How did she know the charm wanted to go with it's twin?
...She always knows:

- - -
_{"There you are, Mister Pathfinder," she piped up, handing him the bag. "And there is a second charm in there...Made from that wayward 8th stone. It's a Rose Quartz, and it's actually a piece that was broken off from the charm you picked out." She smiled softly then, chuckling at the situation that was laid out. "Perhaps you'll give it to her as a paired gift?
On the house--The charm wanted to go with you."}