This assessment of her abilities makes no sense. She's more than likely similar to an electrogenic or electroreception. You forget the chemical signal is preceeded by a electrical one. A higher electrical output from her would cause her to act as an antenna and pick up his electrical brain activity. Her output could only be negligibly higher which is why she requires such close proximity (touch). That higher output also probably stimulates his own activity or over stimulates it rather giving him something similar to a seizure; which is a sudden increase in neural electrical activity.