It’s been reported that she wears a bullet proof vest. Some online have said that she wears some other sort of contraption. Whichever, it’s the same thing she wears every day...IOW, it’s not a microphone wire
I saw on some tech show years back, a speaker vest one could use to listen to music. It was listened to through your body. As to if it could be heard by others close by, I don’t know. Ya just can’t put anything past those sneaky bastards, though...