Yeah, but that's one thing on one occasion. It's not a sustained pattern of behaviour that would logically culminate in the language centres of her brain being scrambled. Unlike, for example, actually leaving the party, refusing to cooperate with possibly-dangerous strangers, covertly investigating her own allies, or spinning an ever-mounting web of gratuitous confabulations about her motives and background that eventually falls apart under the weight of it's own contradictions.
...Just as an example. But Haley doesn't do any of that. All I see here is a girl with a crush who's nervous about it. That's normal.