Like with all animals some snakes are just more skiddish and defensive around humans. She may never calm down. Try and think about things from her vantage point and perspective. Look a things and situations that we might not think is stress full but a scared snake finds terrifying. For example going into shed, after a feed, ect. You may simply want to leave her be only feeding and water and cleaning her for a few weeks even months. Then slowly start earning her trust.
Be prepared you might never have a tame snake..