Often times the only thing you want to do is get away from the wasp. If she were allergic to wasp stings, the fear of that may have overrode her common sense. Cant monday morning quarteback this play.
Or get your kids away from the wasp. I've got three small ones myself, and I would definitely be getting out of our van to open the back doors and try to shoo the thing out and away from them. Of course, now I'll be sure to turn the van off first.