2 issues contributed to accident: 1st - Vehicle did not go into Park when button on gear shift was pushed. Driver did not notice that vehicle remained in Drive and exited the vehicle. 2nd - Vehicle did not automatically engage the emergency brake/park mode it is designed to do when Vehicle is in drive and driver door opens. As a result, Vehicle began to roll forward. Driver was knocked down and fell to ground and Vehicle ran over her legs, coming to a stop with the rear Driver side tire on her leg.