Her whole life is about escaping discomfort, and when given the opportunity she will run away from it.
I finally watched the end of the livestream via reaction channel, and now I'm leaning toward believing that it's this, plain and simple, and I think it's more her usual impulsiveness than outright manipulation at play. The last two times she went to Canada she talked about getting an apartment and staying for the long-term. Then she admitted that a big reason for returning was for the food. I do think in both cases (as in this one) she was trying to escape Salah trying to impose restrictions. This time they may have had a serious enough fight that in the moment she realized she had to choose between Salah/her health and food/noncompliance (and Salah may have even given her that ultimatum) and chose food/noncompliance.
If she does return to Canada, it's not going to be any different than the last two times. Instead of Salah, it's her family trying to impose restrictions. The last time she said her family helped her set up appointments, including one with therapist, probably with a good dose of nagging on their part, but I'm pretty sure she fled back to Kuwait without keeping those appointments.
She said she wants her own apartment for "proivacy," but in reality, it's so she can hole up somewhere and stream and stuff her face to her enlarged heart's content. (She admitted last time that she would have a regular meal with her family, then afterward, go out for fast food.) But she can't afford apartment (in addition to a rental car, mind you) and still doesn't have the credit to qualify for one, which she continually forgets. The irony is, she spends a good chunk of her income on those impulsive flights between Kuwait and Canada.
Who knows. As
@Schmooo posted earlier, we have to remember to be patient and see how things play out, because eventually we will. I wouldn't be surprised if she's changed her moind already.