You can make a great decision (even the most perfect decision) and have it not work out due to LOL random baseball. Something not working out doesn't make it the wrong decision. If Betts leads off the game after the AS Break and goes 0-4, was it a "poor decision" to play Betts? Of course not, he's one of the two best players in the game.
Cora made the right call. Try to save the pen for the long run. It was the right decision and a "good" decision. I hope Cora makes the same decision next time.