I choose magic pen marks cause due her ap carry, HP seals cause she doesn't really needs mana regen, (i never have mana problems if the jungler gives you blue) AP glyphs and quintessence for the extra AP ofcourse.

The masteries are just normal AP masteries and dont really need explanation.

I choose to max my E first for the poke and good dmg.

I choose for Ignite and Flash, the ignite makes me secure kills and the flash has a good combo with your q. You can have whatever you like but I think these are the best.