"The point is, she managed. And so can you."

No, that's called selection bias. The person in your story "managed" because if she wasn't able to, she would have quit her job and found another one, and then you'd have found somebody else as an example. Maybe it wasn't her ideal job but it was close enough that she could manage. It's not hard to imagine a career which would have driven her crazy, for which even eating lunch in the closet would have been insufficient.

If everyone could manage in any job, then nobody would ever need to change jobs.