NDUDE
Smash Ace
![](http://www.smashbros.com/en_us/characters/images/sheik/sheik.jpg)
Look at her right hip. There's a small, sheathed blade. You can see it more clearly here:
![](http://www.smashbros.com/en_us/characters/images/sheik/sheik_080116d-l.jpg)
She never had a blade before...
![](http://upload.wikimedia.org/wikipedia/en/d/d4/Sheik_oot.jpg)
Not in OoT...
![](http://www.hylia.com/pre_ssbm/whip2fir.png)
...or SSBM!
I think it's just there to look cooler, kinda like Captain Falcon's gun holster (yes, he has a gun holster on his waist) since Sakurai mentioned that he doesn't want to use daggers (see: Snake) since they seem more violent in different parts of the world. Of course, she might use it more as a ninja rather than the way Snake would use it...