I'm happy to have relation to ninja's new character (if it were related cousin would work best) feel free to stick her into our location and tag with us even if no blood relation, with okibi being the protective sort he is he would be fine having a 'little sister' sort of character. As for good weapons for her perhaps go mainly throwing weapons? or perhaps a shortsword as thats a good small weapon, or if you wanted daggers why not try a sai, practically a dagger but can catch other weapons in it and looks kinda different. if you went for blunt weapons go with a small hammer though that'd be more a DIY tool than a weapon XD
All in all not sure what small weapons aren't in use if you wanted something unique but i guess you could go like potentially pure throwing weapons? could be interesting to have a pure ranged user