AT first, I thought, "How the hell can she be in that post?" Then I remembered: Yuyuko is a ghost and can fly. :\

She's a Touhou, they can all fly.

Brisk said:
She's a Touhou, they can all fly.

Yes, eventually. Reimu needed to ride a flying turtle before she learned though.

Anyone else think that's poison she's holding?

Very, very unlikely, considering her character and powers (if she want someone to join her in Neatherworld, she can simply Invite them there).

I'd personally expect the drink to be some kind of liquer.

Shiyuu said:
Very, very unlikely, considering her character and powers

Although on the other hand, it seems a little cruel to poison someone using a drink with a curly straw in it.