One word: theft.
Taking advantage of free snacks, fine, it is what they are for. Taking stuff back home is borderline but ok. Not handing back the $350 headphones because no one is looking, definitely not ok. The way she described the situation as "everyone is rich so no need to lock thing up and check everything" instead of "people trust each other". The way she got her meal stolen 3 times in a previous job and didn't report it even though it is significant to her, as if theft was normal.
It is the attitude I noticed from someone who just got out of prison. A nice guy, but he got caught in gangs and drug trafficking. It took a while for him to get back into a world where people just trust each other, where "take it" means exactly that. He has a job is living a honest life now.
I hope that the author is fine now, that she managed to learn the lesson of poverty, keep the frugal attitude and respect for low paid workers while dropping the quasi-criminal thinking that goes with poverty.
Also, that she goes back to the gym, show these assholes who think she "doesn't belong" the finger and lost that fat that seems to weight her down in more way than one.
Also, how did we get to a situation where obesity and poverty are correlated? Really a paradox of the first world.