Trying to project a softball player's potential at eight years old is a fool's errand. We've all seen middling players blossom and dominant players who just fade away.
The most important thing you can do at 8U is to focus on fundamentals and keep the game fun. I coached town travel (mostly rec all-stars) from 8U through 12U, and I am much more proud of the fact that ~85% of the girls I coached are still playing than I am at having identified any budding superstars.