Rhiannon saw the indecision in his face, a familiar thing after she had spent time studying his reactions even years ago. To her surprise, the feeling she felt at it was amusement, instead of hurt that he wasn't going to speak to her outright. Perhaps it was the time between them, or simply the fact that she was different now. Simon was three dead relatives ago, not to mention The Fade and becoming the shop owner as opposed to a free spirited young woman who was able to share responsibilities among several others.
Most likely though, it was simply that she knew him. Simon had no issues attracting beautiful people, in fact he may be trying to remember under what circumstances they parted. It was her understanding that not all of his other, ah, friends were as content with his indecision with she was--and a bit more hotheaded to boot. He may not even remember her beyond a vague face and impression. That should offend her, but she'd rather indifference than hatred.
She sought out his eyes and let her amusement show, head tilted to the side and a single eyebrow raised. Curiosity. What now, old friend? Letting the ball be in his court, as it were. Time would not change that about her. Standing still in the brisk weather, like an art piece on display with a bustling crowd nearby while still largely invisible would have bothered many people. Though not her. It was better for observing and standing still for hours--while an eerie sight for others--did not bother her in the least.