Where the hell were her friends?
Why the hell did they let her walk home alone at 2:30 a.m.?
Dammit, you go out, you have a responsibility for the people you're with. You better make sure everyone gets home safe. No excuses. No letting someone say "oh, it's only a few blocks, I'll just go alone." If it's only a few blocks, you can walk with them.
Unless you live in Paonia, Colorado or Tonopah, Nevada or some other godforsaken town where there's more danger of a mountain lion attack than a mugging, GET YOUR FRIENDS HOME SAFE! And even in Paonia, don't assume that the mountain lions won't be out that night.