Yannam, you've gotten lots of good advice on the importance of accepting your dd for who she is. And, her behavior at 5 y.o. does not predict what her behavior will be like many years from now as an adult. It doesn't even predict what her behavior will be like two years from now (I can use my own dd as an example of that on this same subject).
I think your focus on financial success is premature, to say the least.
But if your goal is to raise a child who will have financial success (for whatever your reasons), I think your basic premise, that a less outgoing nature somehow precludes financial success, is seriously incorrect.
I'm hoping that you'll find some comfort in that. On the other hand, while intelligence cannot ensure financial success, it is often a key ingredient. If financial success were my goal, and it were even possible to choose, personally I'd choose intelligence in a heartbeat over a more outgoing nature. I know quite a few individuals who are extremely financially successful, and I can't think of any of them who come across as having an average intelligence. More relevant to your concern, if the behavior of their children (with lots of OEs, including being fearful/very attached/shy, etc. etc.) is any indication of what these extremely financially successful individuals were like as kids, you have nothing to worry about.
The fact that she didn't want to read in front of a group at 5 y.o. is not indicative of any problem that will keep her from pursuing her dreams - at least that's my opinion. Take a deep breath. With attention to her education and lots and lots of love, I strongly suspect that she'll do just fine
