>>6730504I haven't read it in a little bit, but it was designed to stabilize her in this timeline. However if you look at it even in game, its not touching her skin, almost like wearing a backpack.
You'll also notice during the museum doomfist heist, as well as the King's Row movie, it stops working for a short period of time. This makes me think it doesn't have to be on her, or even powered on at all times. Not to mention when she blinks, thats temporarily disabling it allowing her to move through time and subsequently through space through a perceived faster speed.