How's that? I'll change the katanas in a bit into something else... maybe she could just be trained to use a variety of weapons. Swords, daggers, knives, etc. Or maybe a pure martial artist, no weapons? Her powers come from the Red Laces, which are long laces you tie on your wrists to unlock those powers.

That phasing power might would allow her to teleport her teammates through barriers in the future... or even 'phase' them through time itself.