Dreadful news. Heartfelt sympathies to her family.
So many uneccesary accidents, incidents and tragedies happen every year. These can be prevented in most cases.
BA recently reiterated their policy. Which is that cabin crew may not open, crack or close doors without steps, platform or equipment in place (even for cleaners to get bins out).
Crew may not place feet on the exterior platform whilst opening/ closing doors, both feet must stay in aircraft.
Once an external person has knocked on the door, crew must count to 10 before opening door with caution.
Unfortunately, although rules and guidelines are in place, it won't stop people doing otherwise to make life easier for themselves.