According to news reports, she was walking south along the edge of Mullikin Road and was struck, obviously from behind, by a car also traveling south. Had she been following the established safety rule and been walking on the left side of the road facing oncoming traffic she likely would be alive today.
When walking along the edge of a road, you should always walk on the left facing oncoming cars, moving onto the shoulder when one approaches -- unless the driver has obviously seen you and is giving you a wide berth.
It also is advisable to move into the shoulder when a car approaches from the other direction, in case a second car attempts to pass it.
Hugh K. Clark