Ok, you need to get a picture phone.
Mind you , the sketch is very nice...

but given the access you have in the local area and the statistical probablity of a possible third sighting. I say again... we all want you to get a picture phone and hunt this woman down... now... right now... what are you standing there for!? Go Go Go...
*Gabs computer and starts googling for Sprint PCS in a flurry of activity*

Donations for picture phone bill to be sent to the above person ASAP...
-Also-
One thing, I will add is that many people don't look at the people around them when in public places. I personally am a people-watcher and I look around constantly (Situation Awareness is the term I guess) but many of my friends when asked "Did you see that girl, did you see that?" have not a clue about it and have missed most of what I see out there.
I think that its common with some people to be very observant

(hence they catch a lot of things like this) and others to be less so

(hence they miss most of what is around them).