My female normal balls up a lot...she's easily startled. My Mojave male, on the other hand...I almost never see him balled up. He isn't easily stressed, and actually seems to like being taken out, handled, et cetera.

And then there's my Cinnamon, he does neither...he spends every waking second trying to come up with ways to bite. I just love how feisty he is!!!

Each snake has his or her own level of tolerance for stress and they react as they feel appropriate. Be glad your Ball isn't balling...and hey, maybe consider introducing her as a "Royal" python like I hear they do across the pond!

Royalty must never resorts to the fetal position.