The Disappearance of Tiffany Whitton

Here's a frightening figure. Every year around seventy thousand women are reported as being missing in the United States alone. Of course, many are not actually missing, and more are quickly found, or return home easing - to some extent - the anxiety of loved ones and friends. In 2013 Tiffany Whitton became one of the few who went missing - and was not found. More than seven years on, there is still not a sign of her.
In all probability, she is dead.  Pretty much the last sighting of Tiffany, however, saw her as anything but dead. Lost, maybe. But very much alive. So much so, in fact, that it seems as though she is high on some kind of illegal substance. In all probability, this impression is correct. It is two am and she is out shopping. Actually, that is not the perfect definition of her early hours' escapade.
She is out shoplifting. In Walmart. Security cameras quickly identify her as a person of interest, and soon several electronic eyes are trained on her. In these small hours she is behaving as nobody else in the store - not as most would behave at any time of day, let alone the earliest part of the morning. She has a Walmart shopping cart. She pushes it before her and drags it behind her. She constantly fills and empties it.
She throws in shirts and casts them out again. It is highly suspicious behaviour. It draws attention to her. Surely not what a shoplifter wants. Is it?