It coincidences with her move to Bloomberg from the Mercury News. While at Mercury she was definitely more balanced, one might even say slightly 'pro Tesla/EM. The switch to Bloomberg would be considered a move up for a journalist I suspect but IMO Bloomberg wanted more 'clicks' from her articles resulting in a bias towards negative/click bait articles concerning Tesla.
Her pay has probably increased with the move, and, IMO, her objectivity has decreased substantially.
i thought it coincided with the jurvetson scandal, and how draper fisher dropped him but tesla board kept him. pure speculation, but would explain (especially if she had inside scoop on SJ, and it was bad news).
...improbable though
more likely just for clicks