It was clear from the start of the fight that Pennington didn't want to be in there. Sure, she said it out loud after the fourth round, but so what? Like the announcers said, if you want to quit, tell the ref, not your coach. I assume her corner knows her best and made the right call for her.
Besides, if she had made some hail mary KO or submission in the last round, everyone would have been praising her coach for keeping her in the fight.