Great fight.
Surely, though, if she could just telekinesis the sword, why not go for decapitation instead of a body shot?
Several reasons: The first is that the torso is a larger target and, therefore, easier to hit; additionally, the extremities (head, arms, legs) move
far more than the torso, making them harder to hit reliably.
More importantly, decapitation, even if you could do it telekinetically, requires a fairly large swing (which means it's telegraphed); it also requires decent upper body strength to get through the spine in a single swing (which is why manual beheadings of criminals used a very large axe or a specially designed sword with a squared off tip that moved its point of balance very far forward so that you wouldn't
need strength and could just let gravity do the work).
With that in mind, a thrust to the torso,
especially from behind is
much faster, provides significant damage to internal organs, and can be turned into a cut on the way
out of the body (as she sorta demonstrated), drastically enlarging the wound. It's not as instantly fatal as decapitation, unless you hit the heart, but it's a faster attack and more likely to land while still maximizing damage.