some snakes just have a bit of an attitude and while she should settle with age she may just be a bit feisty for life.
one thing I would recommend would just be confident and pick her up, its when you get nervous and maybe touch then let go if she flinches that they get all puffed up.
another thing is to cover your hand with a paper towel and just cover her up then grab her out of the tank, she should ball up and be fine once you get her out.