As u can see through ur comment u talk a lot about mid lane/early game.. In teamfights come the hypotheses
She is really good early as I said... no one can deny that.... she may even be the best early champ so far... however she still needs a boost for late..
Wait till the buff coming out in next patch and see how more viable she becomes..
I was validating early game because I feel this is actually where she is the weakest. I feel late game she is really powerful, BUT, item dependent.
If she gets buffs fine, but I really feel she doesn't need them is viable now. "More viable"? No, just easier to use and less tactical/quick thinking. She'll be easier, not "more viable", as she is already viable enough.
Best early champ so far? What? Not really. At level one she's really good with her pokes, but then she needs to wait until 4 to get decent with her cc, and by then things get sticky, requiring a lot of good calls.
She's a mid game champion in my opinion, and late game if you get the items. There are other AP mids that are item dependent as well.
EDIT: I would -also- like to point out that I play her differently than most. Most build her somewhat tanky. I build her full AP as I feel tank masteries/runes give her too little of a defensive boost with too much taken away from offense. I build an early Rylai's or even sometimes Abyssal. Abyssal may seem odd but it gives you MR, AP, and MASSIVE penetration at that level. One could argue Anthene's but that's not really worth it imo that early. Personal feelings.