If she has Mar/Par aids, and using select iN, those licences can go back and forth.
I GUESS same can be done with roger direct X little cube like devices (and Mar/Par aids), but I didn’t try so I don’t know if you can move licence back into them once they’re out. You should be able to do so by logic of how it’s supposed to work, but, I don’t know how exactly the device used for licence transferring exactly works.
Other aids need those X cubes directly anyway.
With select iN mic you don’t need such additional device used for licence transfer, and licences can go back and forth between various aids and that mic directly with a press of a button in specific order. iN mic comes with and holds two licences (for two aids).
I mean, ‘licence’ is basically just a key to unlock feature, like windows activation key if you’re familiar with such concept from software world.