Ariadne & Star
She probably hadn't noticed because Star had been playing with the floo network. It was almost as fun as teleporting! which meant she'd been going back and forth between the shops instead of actually shopping or helping to show off her bean bags and color changers.
She had managed to keep herself from running into anyone so far but she had flung herself out of the fireplace ery enthusiastically and ended up stopping not too far from the woman looking at the books.
"Just a fraction of what?" Star's hair was a little wild with a lock of it stuck up over her horned headband and she was grinning from the last trip still.