This game is somewhat typical, because Moro is the favorite and supposed to play for a win. Hou plays a sideline, which seems to provide him with the opportunity, but things didn’t work out in the end. The piece sacrifice is actually the move with the highest engine evaluation, but the whole concept looks dubious to me. Black can defend with the same amount of pieces that white can attack with and I don’t see him grabbing two more pawns in order to restore material equality. Well, at least he managed to grab one.
Update: She also beat big guns like Navara and Bacrot to win the tournament. Nice!