Не понимаю, что такое "shone over a smile".

В контексте:

So she embraced blackness instead. Clenching her eyes tightly shut, she rolled herself into her blankets until they enshrouded her like a cocoon. Somewhere in the midst of that lonesome dark, she felt her head filling with her own heartbeat. It was something worth dancing to, and it made herself feel like she had the ability to show off once more.

And as if to grant her most secret wish, she had no dreams that night. When the stars passed over Rainbow Dash, they shone over a smile.