Once again just my own interpretation of how these systems would work. Take with grain of salt. Surface level and at low power. There isn't a notable difference between Telekinesis and Gravity manipulation. As both involve moving things around, just the how is different. TK grab things or alter Gravity in the area around a thing. The floaty nature of how Jinny is moving things/lifting herself could be a result of Gravity manip rather then TK usage. As the need for bubbles of effect rather then direct targeting reads slightly more Gravity then TK. As TK is like having invisible hands that reach out and grab/move things for you. Rather then causing things to fall in a direction of your choosing. The floaty nature of her flight, the delayed effect on the dart, the need to calculate the forces involved. It can easily be seen as Gravity manip. By that same token it can also be seen as a TK who is using a wider grip then is needed.