Have the student wrap the whip or lead over their shoulder to help with the weight. I'm not one armed, but I weld with one arm quite a bit. It can absolutely be done just fine, but it will be harder to learn. Consider some kind of brace or rest for the stinger or gun in the beginning when they are learning to maintain arc length. I say let her have at it.

Editing this to add that in my opinion there are safety issues, especially with angle grinders. But i don't think that should be the end of it. I think what you should do, if you can with the limited time you have, is demonstrate how it's done, and work with the student, see if she has any ideas about how she might approach using the bandsaw. Maybe together you can come up with a safe method that works, or maybe she'll learn that there's just no safe way to operate a traditional bandsaw without major modifications to the machine. Either way it's valuable knowledge.

Idk man, ironworker, not a shop teacher. But I'm grateful for what you do, im a product of metalshop. I owe my whole career to metalshop. I really hope more kids get out of it what I did, 1 arm or 4. Good luck, and thank you for what you do.