no worries debc52 - this is how we all learned!
The females are larger and take longer to develop, so that is why we want her to wait for a few more days than her brothers. She sort of knows by instinct, but sometimes a lone female can fledge early if the others go and don't come back to visit.
I'm hopeful they will come visit her though; they do seem to hang out together which is good, I think.