It seems as if its already rare for her to use it which puts a limitation without me needing to nerf it. And also you would have to follow any rules on "would I be able to teleport to this location." For example, some areas may be off limits or just unaccessible at the start of the game or throughout.

So if you're fine with that, I will allow it.

If you wish to keep her dependent and the machine is small enough I would say sure, bring it with her. If it is too large for her to wear on her person then I would say remove the dependency.