EDIT: I cant possibly count how many times I have re-read one of my post I feel like I sound like a total ass, and failed completely to say what I wanted to say.
Have you read a comic book by Allan Moore called Promethea?
The basic idea of female strength is quite similar, and specially the way he's straight on adressing sex FOR the symbology, that completely changes the whole look on sex and makes it something that couldnt be further removed from plain jerkoff material.
in fact....
SPOILER
she in fact turns out to be the whore of babylonia reincarnated, and that's a good thing.
The whole comic is structured around that idea of feminity and it does it quite ellegantly.So honestly after promethea, I dont think I would be shocked even if you're planning to have the girl save the world by having tentacle sex with Cthulu in the end of the game. I'd really like to know what it is and let me tell you I think it's great somoene in here is actually trying to convery a positive, strong message with their game and is not afraid to use whatever symbology she sees fit for this. I wish every game was like that.
The breast/vulva symbol is looking pretty good too.
Though, I think you should not put it in the hilt like that. I mean think about it, if there's a blade coming out right from the middle of the vulva what you're really saying is she has penis envy. That she wishes a penis came out of her vulva. if you really want to emphasize female strength then put the symbol in the hilt, and make her use the hilt for...I dont know, sucking out the aggresivity out of enemies or something, otherwise you're just reinforcing the currently widespread model of "executive" women that are simply trying to take over the usual place of men.
You should look out and read Promethea.The comic has a lot of symbology and I think it could give you great ideas for ways to go about this, and it would doubtlessly expand your mind a little about what language you can use to do whatever it is you want.