I loved this story. I'm not into the whole meat girl thing, but this story, as I read it, was more about the psychology of role playing, with the meat girl serving as a representation of the girl's livestock like status.
The writer did a wonderful job of describing what was going on Emma's head, and explaining why she was so turned on by the fantasy (even if she didn't want the reality). The goal is to edge yourself, and feel the risk and danger and humiliation, ramping it up as far as possible so you get 99.99999999999% of the way there, without ever adding that final decimal point.
The other aspect of the story that I love is how, once in her role, things go out of control. Losing control is part of the fantasy, of course, so adding some REAL danger only makes it more exciting. You capture the mental game perfectly.
The obvious way to do that is to include people in the game who don't realize who she is, and will treat her like just another piece of meat. So the drivers and customers become part of the thrill, as they are giving her that genuine experience.
Once Emma becomes livestock, and totally objectified, so being left in the store over night, or having her head shaved, or being bar coded, or even sold, become routine. Nick can walk past her without even noticing her, because, after all, she's only inventory.
Brilliantly written. As a side not, I've written a number of slave girl stories on Literotica that have a similar tone. I hope one of my stories inspires you, the way your story inspired me.