Gravity will help her get out, hopefully not too rapidly.
This woman might be a central character in the nightmares of a Tokyo subway pusher.
Years ago, I had a student of a similar girth that required two desks to sit in.
Lamentably, she always came a-waddling in several minutes after the class started, and her getting into the two desks was a major spectacle that made it practically impossible to teach anything until her elaborate machinations were complete.
There was also the problem that half the class thought it was a laff riot and the other half wanted to fight with those who laughed.
It took rather a lot of patience on my part to deal with this. I never laughed and refrained from saying anything regarding her, other than calling on her in class, as I did all the other students.
She dropped the course and said it was because I did not provide a proper desk. But there were none in the building.
Students told me that she simply preferred to play bridge in the Student Union Building to attending class. At the end of the semester, she passed one course and failed all the rest.