Woah! No don't listen to the other posters. They've just become numbed by the 'interweb' and 'television' to the complex and intriguing social interactions that lie around every corner.
In this instance I think we need to consider the background and upbringings:
She's probably had a late night -
Sshe feels a bit sad when shes alone, but she doesnt really know why. She knows shes better off than so many people, and that just makes her feel more guilty and more upset. So many evenings she cries herself to sleep. It's pathetic and she knows it. Infact, recently shes been feeling a bit better, but her sleep patterns have suffered. Shes slipped into a routine of late nights, and just cant get out of it. Having gotten to sleep at 4am the shrill chime of her old fashioned alarm (she likes those kind of things) set her day in motion. Or at least it would have done had she gotten up.
Arriving late at work she set about her routine. It turns out the guy shes fancies has taken the day off ill, and the absence of those stolen glances, her secret glances, which usually would lift her mood, spirals her yet further downwards into dismay.
As her shift nears its end she plans her evening ahead: walk home (in the rain no less) get unchanged, stare at herself in the mirror before deciding there'll be no dinner tonight, watch tv, before stripping off on her webcam to some guys in estonia. As she wonders what she's done with her black push-up bra some guy turns towards her.
"hi do you stack the shelves, do you have tikka sauce i can never seem to find it"
She gives the guy that 'once over' look that only a woman can, and laughs to herself. Hah, she thinks. Here is exactly what she needed, that very model of 'those worse off', stood in front of her. A heap of a human being. she smiles.
Not really caring or hearing what the person says, she casually dismisses them, noting the dazzling shine given off by the thickly greasy hair under the fluorescent supermarket lights.
She was about to continue smashing tins of beans into the metal rail that runs along the shop floor - protecting the isles of goods from runaway trolleys (such a good stress relief), before placing them at the back of the stack ,when the guy turned and started coming towards her.
"Oh what the hell now" she thinks. "I wish you'd just trip and die, like my bastard grandad [for all his negative qualities, he was a proud man, her grandmother had insisted on a stairlift, but he always refused to use it. Needless to say grandma 'told him so' when she found him in a heap at the bottom of the stairs" The thought flashing in her mind, with surprising speed and clarity considering the complexity and length of the string of consciousness.
With a stagger the disheveled figure, does, surprisingly trip a little. Before righting himself. Rather more shocking is that the only thing she herself thought was 'if only I worked atop a flight of stairs'.