[ Roxy is very much a night owl - partially because her best friends have been in earlier time zones for as long as she's known them, plus being naturally not a morning person. So she is perfectly happy to work evenings bartending for Eric at the Blood Shack. She's actually tipsily on her way home from that when she passes Madoka and recognizes her.
And of course, y'know, she's friendly! So she grins widely and waves ]