I mean in this issue, she caused a gas tank to explode, catching one guy. He would be chunks were it not for plot armor.
I don't think training would help Steph, really. It's a sad fact that some people just *don't* improve, don't change and cannot be better than they are. Spoiler really strikes me as one of those people. I mean, being a crime fighter in Gotham oughta be hard than putting on a funky outfit and taking gymnastics after school.
The person ought to be exception in some way, and Steph simply isn't. Nothing wrong with that, but she should really be out of her league.