At this point you'll just have to wait and see.

The pre-flowers on both my females came out seemingly overnight once they decided to do it. Both showed on the very TOP first.

Then I HAD a third plant that didn't seem to develop for a long time. It was the same age, and assumed genetics, as the other two. It just didn't show sex. Unfortunately it hermi'd.

The biggest downfall to bag seed is not knowing what you started for MANY weeks. Hence why many buy feminized seeds, or clone from a known female. Another option is to start a few seeds, then pick the best female of the group, discarding any males.

I wish you luck on your possible girl.