One word:
BORG
A "pacemaker" like device for her undependable gait? In reference to her fall on the temple steps in India, someone posted here a while back something to the effect that her right leg did not always get the signal to follow a step by her left leg, and she has no awareness of the inaction at the time ... she just continues with the next left step and falls. Maybe this device nudges her inactive leg into action when needed.