My year and a half year old boa does about the same thing. He has struck the tub before when I or my bf would walk by, and when I reach in to get him he gets into a "S" strike position and looks like he'll strike at me (he hasen't struck at my hand though, it's a bluff). He can be kinda squirrely out of the tub but he does calm down like yours does.

Double check your husbandry, make sure you're feeding the proper amount, and next time she throws a fit don't hesitate and get right in there and pick her up. In time she'll calm down and realize her huffyness isn't going to make her get out of being picked up.