I realize this is largely anecdotal, but in my experience boys are taught chess much more than girls. Most men I've asked at least know the rules, even if they don't play often; women, not so much. Again, it is possible it's just my particular sample, and if anybody has any actual data I'd welcome it. If indeed this is the case, it would largely negate Elubas point: you can't consider whether you want to do something you're never exposed to.
This bias in who is taught chess seems likely to me, because chess is largely consider a male activity, in the same way I'd wager a much larger proportion of girls than boys got dolls (or toy kitchens!) as children. And a girl's only tournament seems like a good way to combat this. A parent may have never considered teaching their daughter chess, subsconsiously dismissing it as a boy-activity: the existence of a chess tournament for girls automatically challenges this preconception.
There isn't enough time in the day to reevaluate incredibly trivial things was my point. I've never thought about a profession in wood working, but even less in being a secretary (having trouble thinking of what profession I might feel is un-manly). It's going to take more than curiosity to make me consider seriously something that 1). I could care less about currently and 2). I don't feel like I'm cut out for.
And it takes experience to understand these things too. You can't just philosophise alone in your room... "am I cut out for ______ even though I don't think I am?" But if a group of people as a whole are brought into contact with an activity, then you're affecting those who would have otherwise never had an opportunity to discover their enjoyment and potential for the game.
If a girl is interested in chess, I would expect her to play chess regardless of special tournaments and titles... and of course that's exactly what happened. Female chess players go back further than 40 years. What was missing wasn't an individual ability to decide, but a sociological phenomenon where females as a group were grossly underrepresented.