Never noticed that. Hm, gotta re-watch it. Yet, creatures from hell are winged-too. I just never understood Why she should end up at Hell at all. Like, she's been fighting on a Good's side, despite Dracula's hints of Dark source. Still, all she ever did was to sacrify for [Good], fight, resist Evil. She never was a villain. There's no reason of going to Hell, especially after willingly dying for Dawn and Humanity in whole.
Scoobies' just been living too long near the Hellmouth... lol