"They're right, Prime," Diana spoke, as she descended down from the sky alongside them. Her expression was calm, but inwardly she deeply bothered that Prime had apparently already engaged the League. She'd hoped that Bart's presence would be enough deterrent until they could figure something out. "They haven't done anything to you. They aren't responsible for anything that happened."
She was taking a gamble here, but she'd already lost Kara from one world, and Bart from her own, in addition to Connor, the Amazons, and more, all to Superman Prime. Her League here had yet to know these things firsthand.
"I'm from your time," Diana said, quietly. "I was on your world with the rest of my League, before the Crisis destroyed it. If you wish to keep fighting this battle, then it would be mine. But I'm hoping you've had enough of that." Her voice was almost kind as she said, "This world is so like your own. There, you were Superman. Here, no one has known otherwise. You still have a chance."