You mean "mute"...
She will have her role in the final game. I promised players Shana in the first demo, so in the next release, she will be playable, but she's, how should I put it, a silent character for the time being... except for one of her techs, which just has her yelling, "Urusai! Urusai! Urusai!", the tech is completely useless, but acts as a joke/something awesome.