No, but I'd like to. In my book, "just for the hell of it" means "just for shits &giggles" or "just for fun". And imo those kind of of dates are always the best one's. Why? It's simple: no pretentions (at least not from your side), no pre-set goal you want to work to. It makes things more relaxed, chilled out, since you focus on fun.
Btw, the girl you're talking about, Mr OP, is pretty damn direct and honest. That shows guts, metaphorical balls (unless she has a pretty good rack, those also count as balls tbh), wich is pretty awesome and admirable. If you ask me: go for it, if you're not interested that much but you don't mind, just go for fun, maybe something nice will grow out of it, maybe a spark will fling over, maybe not, and then you just had a good time with someone. Nothing to loose right?