Some people might poo on this, but has anyone consulted a psychic? Cant hurt; might help.
THE SIGHTINGS AND LACK THEREOF
SECURITY -- Im thinking the maybe "security" folks may not tell the truth if it behooves them. (particularly if they know they weren't on camera.) Iow, "Ut-oh, I kicked out some kid who is missing now..." So... um... no ... I don't recall." and "Nope didnt see her; Sorry" Sad, but some people will lie to save their tushies or if they think they're saving their tushies.
PASSERSBY -- Additionally, the Pantera Tshirt and her unusual attractiveness and very light long hair do make her stand out imo; so it's a little odd that more people aren't reporting seeing SOMETHING - which tells me maybe they did but... BUT - Ok teh "but" is that I could fathom an uninvolved third party thinking to themselves that hypothetically, yeah, they saw a young woman fitting her exact description and she was scuffling with a man who had her by the arm.. But now they fear that they'll look like jerks b/c they didn't do anything to help her at the moment. So maybe they decided to keep it to themselves for fear of public backlash or whatever reasoning they come up to make themselves feel better.... IDK.
Im just the opposite; I report stuff that is probably nothing just in case. But some folks sadly, dont want to get involved for whatever myriad of reasons that they tell themselves in order to rationalize it.
JACKET/COAT
It seems so simple to tell us if she had a coat with her or what happened regarding a jacket. My point is and-I-do-have-one, ... even if she took a coat in, if she were only planning to go to the restroom (which is inside) then she would have for sure left the coat at her seat. If she left her seat with her coat to go to the restroom, then may suggest that she was planning to go outside imo. Sorry I keep raggin on the coat, and maybe there was no coat at all; But they haven't definitively said, have they? And even the smoking area is inside; but did she know that? If she is the only smoker among her group, that may explain why another girl didn't go with her.
The coat speaks to intent in several ways imo. It was cold (40 degrees) and lightly raining that night and the rain likely made it feel even colder. If she were outside without a jacket, that would perhaps make her a bit more motivated to find some place warm. Also, if she had a jacket on, the very distinctive "Pantera" part of the t-shirt would have likely been partially or completely covered.
This takes me back to the G D car (about which no one will tell us the exact parking spot.) If there were a coat at all and if it were left in the car, all the more reason for the friend with the car keys to meet her at the gate and give her the dang keys...unless she didn't want or need them which seems to sugget that there was someone else at hand or she thought there would be. Or maybe there was no coat period. It wasn't part of her initial description. And long live the run-on sentence.
HAIR
How did she have her hair styled? Long cascading blonde (light-colored) hair is an eye catcher for many males, and females for that matter. Not only for the sexual attractiveness factor, but for simple functions of the eye and how we process color and contrast. With long blonde hair falling on a black T-shirt (vs pinned up etc ) and/or all black ensemble, the very light blond on the very dark black makes a memorable image, for one, just b/c of the high contrast.
Was she in the habit of starting the evening with her hair down and later pulling it back or pinning it up? Or for some chicks, when it's down, it stays down.
DISTINCT T SHIRT
Add to that the "Pantera" name at a Metallica concert; not earth shattering in and of itself, but perhaps it's somewhat memory catching for some or many, especially when coupled with the other physical descriptive factors. Then add to that that she has a cute figure and beautiful face. Im a straight chick and I believe I would recall seeing her.
THE PURSE
What kind of purse did she have? Or did she have one with her? or was it in the car? Shoulder strap or hand-carry style? It's harder to drop a shoulder purse. Is it customary to take a purse into a concert? Seems like I'd take my phone, a little cash, maybe ID - and leave the purse in the car.
IDK