Most don't expect to find young women wandering the night alone, less so those who seem to be both attractive and improperly attired for the colder temperatures one encounters without the light of the sun.  Those who find this suspicious and potentially dangerous tend to be a lot safer.  Those who would find this innocent looking young woman to be a potential target for any sort of mischief seem almost baited into some kind of trap.  Nothing about her mannerisms describe her as anything other than a normal young woman, no palpable aura of wrongness radiates from her, but none the less the astute will see something out of place where the foolish will only see something interesting.