Downwards
Step-by-step explanation:
A net force vector is the sum of all forces acting upon an object with respect to the object.
As we understand in this situation, air resistance works opposite to the Gravitational pull of Earth which is pulling the skydiver down.
Because air resistance is not strong enough, the woman falls at an accelerating speed because the gravitational pull is stronger.
SO the net force is pulling her downwards.
Thus, the force vector will be pointing downwards towards the Earth.