She's said in the past that she doesn't want to be a content creator forever, and that she has other aims. I think her content is, at present, golden handcuffs. She still makes good enough money off it to justify doing it, even if she kind of doesn't want to. That was definitely the vibe in MT and HT, though she seems to have perked up a bit recently.
If video creation was a passion in and of itself for her, she would be using it to help her get through and it would be her happy thing. However, she only ever portrays the best version of herself, and so I believe she is using it for positive reinforcement from fans. When she doesn't have anything positive to demonstrate (coffee fuelled late night essay crises are unfortunately not her brand, even though she's definitely had some I reckon), she finds it impossible to make content because she fears she won't get the "oh wow you're so smart" "you're so inspirational" "you're a role model" that she relies upon.
Couple that with the fact that she doesn't really have anything else going on in terms of marketable skills to get her a similarly well paid job, it's no surprise she continues to slog on (again, she seems to have refound some passion for it with her "absurd day" videos, which I enjoy, personally). She won't stop until she finally goes off the rails or it finally stops making her money because people have stopped watching.