A lot of people here and elsewhere have been fretting over an earpiece. Listen folks! -it’s a small piece of electronics that depends on the electromagnetic spectrum! Just jam the damned thing. ANY frequency (especially near the radio end of the spectrum) can be blocked. Block it.
That is a great solution. But a really great idea would be to hack into it and feed her confusing information. And if that couldn’t be done, then play some sort of annoying noise that is impossible for her to tolerate.