Just play it as you are. The basis of your powers is another one of my unrevealed reveals.So is your identity. I missed an opportunity to add that Mellisande mixed her movements working with the machine to rhythm and music she was hearing in her head. <sigh>
There was an argument going around on whether Traveller RPG or Metamorphisis Alpha was the first science fiction game. However, this was resolved when Jim Ward declared M.A. to be a science fantasy game, as hard science and realism was not as important to the game as it was to Traveller RPG. I hope that helps. And right now Mellisande is probably as befuddled as you are in the balancing of the thought. As for Knowledge- Arcane, I see it as the equivalence of understanding computer and technical languages. Use Magic Device is the equivalent of having a functional knowledge of a high tech device. If you haven't figured it out yet, your wands of magic missile are laser pistols with auto-seeking, your belts of shield are force fields which help deflect blows and magic missiles, your staves of fireballs are the high tech equivalent to rocket propelled grenades and your healing devices are med-kits, fast acting liquid gauze or stimulant injections. And so it goes.
Queenie, Mellisande has Dispel Magic and can spontaneously cast it. Doesn't mean we can't both benefit from it, but since we're both spont. casters, you might want to get spells that aren't doubled up.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.