Based on the following strip, I'm pretty sure she's just crying theatrically, not throwing up. "Oeeeee" sounds more like the usual "wailing cry" sound effect than the "vomiting" one.
ForteGVN said: For a sec there I thought that were Yukari and Yuuka. Things suddenly made no sense, why Lily why?
The more the reason why a Touhou without a Touhou hat is not a Touhou~
And you used to be so cute way back when...Kyaaaaaaaa!W-wait, don't cry!Well, excuse me for being smaller than you.Uuubbblllrrghhh!Yuuka-chan, you're so cold...Drunken FrenzyOh, no wonder--these are your clothes, Yuuka-chan!What the heck, Nee-san? You stink of alcohol. Hurry up and leave.