This would be an effective way to treat prisoners - naked at all times and effectively restrained when it was not necessary for them to be mobile and plan problems for the prison staff.
I agree but, medically, she needs to be able to move.
Left to me, I would torment her till she was exhausted (vibes & whips, for example). It would be then that she could rest.
Don't want to bore my subbies to death.