I'm posting for the first time!
I have to say, though, that when I was in college, even when blackout drunk, I did not just "pass out" (unfortunately), but I became even more hyper and could function pretty normally - even text. No drugs involved. I think people just react differently to alcohol. Some say she must be on something else besides just alcohol the way she's marching around with so much energy. I am not kidding when I say just drinking liquor did this to me, too. I wasn't a beer drinker - it put me to sleep. But I loved liquor in college, mainly, because I became like the energizer bunny and ready to go all night.
BTW - I do not think she was lost. I think she was looking for someone. I think maybe a guy interest who she heard would be out somewhere. Maybe she just caught wind he would be "out" and that's why she was looking all over town. Who knows, but I do not think she was lost.