Put me in the "she didn't do anything wrong, but she didn't do everything right" column. Killing the soldiers, that's fine, that's war. Hanging around to party and train a handful of people, some elderly, probably most malnourished, is stupid. She's setting them up to die, and I'd wager her only reply to that would be, "They died as my sisters!" which is great for her, since she's still alive to celebrate their glorious deaths. I'm not sure how they'd feel about it.
If she can lift a plane, a fairly big plane, then why isn't she carrying them the heck out of there? Dragging them on a raft? Anything but getting drunk? If I fault Diana with anything here, it's not using the Wisdom of Athena tho think her plan through.