My younger son's very obvious gifted behaviors, including very early reading, were what finally got me to realize that more was going on with my older son than being "just slow" (which is how the school psychologist described him).

It took several evaluations (and a few misdiagnoses) over several years, but he was finally diagnosed properly as HG(ish) with dyslexia.

If you think your daughter is 2E, you're probably right.