It made no sense that LSU put their worst defender on Caitlin for most of the game. Maybe it wouldn't have mattered, but I believe it was a serious coaching mistake. They should have switched Johnson on to Caitlin after the barrage to start the game, but waited until the end of the game.
My assumption is concern that Clark would get Johnson into foul trouble much earlier than she was. Chasing Clark around for 40 minutes would also severely impact her offensive game, and they really needed her points.
Honestly, the best answer for Clark isn't the sportsmanlike thing to do, and it's just trot out some scrubs to rough up the game and get in her head.