Transfer of control --
If I recall, the full report stated that the Captain initiated transfer of control not by saying "I got it" or "I have control" -- but by chopping off the throttles at low altitude. Only after she chopped the throttles did she inform the PF that she was taking control.
Then apparently the Captain realized her mistake and started to apply full throttle a couple of seconds before impact.
Then she changed her mind, and chopped the throttles for a second time. Oops!
But she made another mistake -- she didn't pull the left throttle all the way back, leaving the aircraft with asymmetric thrust just prior the crash.
Meanwhile no one was actually flying the plane as the control column was left at neutral, all the way until the nose-down impact.
Not the finest day for the co-pilot for sure, but it's also hard to defend / excuse the Captain's actions. Unfortunately for her this was a career-ending accident.