If Fatty put in absolutely any effort whatsoever, then she would lose weight. At her (admitted) size, she could still eat thousands of calories every day. A few minutes walking would help her burn a shit-ton of calories when compared to an average sized person doing the same thing.
Her step count is complete bullshit. Even 2000 steps plus, in a one level apartment is not realistic. People who live in a 3 or 4 bed house, who go up and down stairs a few times per day would struggle to hit that number . Add the fact she's lazy as fuck, and I doubt she would hit 500 and that's being generous.
Best case - If she sleeps in bed, then bed to toilet, to kitchen, to couch. Then possibly to the bathroom for a shit. Then to bed. And that's a good day.
Probable - Sleeps sitting on couch. Shuffles over on couch to piss and shit. Possibly goes to kitchen once if her caretaker's out and brings as much as she can carry back with her. Then sleeps on the couch, sitting up.
The only extra steps she would get in, are if she has to answer the door for her deliveries and when she's filming, so she can prove all the hates are wrong.
As for 'actively losing weight', taking her day 1 to be our day 0... In 4 days, Her Royal Fatness, starting at just shy of 500 pounds, has somehow gained 2 pounds.
As for her calories, over 5 days, she's pretending to average out at a little over 2500 per day. She would be losing weight quite easily if this were true. Instead of gaining, she'd be losing the same numbers, if not more.