>>105581227Water benders inexplicably levitate their element, why shouldn't earth benders sometimes get to do the same.
If it helps, think of her powers as 'telekinetic but only for rocks' and add some clause about the force exerted scaling with the mass of the rock up to some limit.
The thing which bugs me more is characters levatating shit through "magnetism control", unless your floating a super-conductor you should really only be able to cause attraction or repulsion to stuff in ferrous metals. The best explanation for the magneto form of levitation using magnetism would be somehow creating a strong monopole in an arbitrary fixed point in space for the object to be attracted to, sticking it at that point.