Sound manipulation ain't taken, but stuff like super strength and such is. Not sure about super speed. Why not do both and call her 'Sonic Boom' or something? Like she could create 'dumb holes', the sound version of black holes, and then the shockwaves of sound after they expire are so powerful they're almost small bombs?

Me just rambling ,but that'd be pretty damn rad. She could just create sound by moving so fast, then 'bottle the sound up' using sound manipulation, then use the resultant massive amount of shockwaveyness as an attack. IIRC, there was actually a project by the U.S. military for a 'sound weapon' not that far back that was actually really damn effective, I could totally see that being a great superpower.

But yeah, I am just rambling, do what you shall, just me suggesting.