>Thus, as she get's older the test effectivly gets harder
>( not really )

The test gets harder, but she get's smarter because she learnes more every day.

>If she stayed as smart as she was now, and waited a year,
>her IQ would drop.

She can't be as smart next year as she is now because she really does learn more.

>Also practicing for an IQ test rarely works.

But it does. My sister took second IQ test and got 160 this time.