I just don't get general defensive strategy in girls softball. Why in the world was the outfield playing shallow with 2 outs and a 2 run lead. The ball that lead to the triple should have never been over the fielders head. You got to keep the ball in front of you in that situation, the runner on second meant nothing!
The problem I think with what you are suggesting is that this was the slap hitting portion of the lineup. Not only that, but can Oklahoma slap hit in a more "versatile" way in that have the ability to slap for a triple or sac bunt. Really unpredictable one honestly.
If you are playing percentages, it is much harder for these slappers to hit over the heads of outfielders than bloop one (similar to what Tori Lewis did to Washington to win the game) between the infielders and outfielders. On its face you can say yes I'll take letting them hit to shallow outfield and keeping the ball in front of them. However, since that play is much easier there was a greater likelihood they would continue to poke the ball there and then all of a sudden you have bases loaded off multiple singles.
Bottom line in my opinion is that Oklahoma not only made the hits they needed to but to some extend lucky because of the placement of those hits was nearly perfect.