Yeah, that's the point. XD Logically, surviving something like that would disfigure somebody like crazy. Pokemon's not that X-TREEEEEEME, so I say it's safe to assume that she's vaporized.
Or alive without a scratch. Because she's J.
Because the writers would have a hell of a time coming up with a reason why she wouldn't literally look like she's melting away with various chunks of her body missing.
Wow, I just got all dark and gory there.
Because she's J.
I'm not saying that's a good reason, but I think ultimately, if she were to appear later, that's why she'd be fine. (She'd be all, "You thought you've seen the last of me, huh? Well no one takes down Pokemon Hunter J!")
.........
Still, though, if we never see her again, after that explosion in that D&P episode, I'll have no reason to believe that she's alive. I don't think the writers would want to make her fate ambiguous, so either they'll bring her back eventually or they won't.
I'll give her, like, a year and a half (real time). But I'm not anxious for her return...