Alot of People say Leia was more powerful than Luke and even Lucas has here and there made coments towards it , but nothing in the movies shown here to be anything of a force user other than her link to Luke .
So in the end , Movies > Lucas later coments.
Till he remakes them to show otherwise , ever current copy of ROTJ show Luke on the ground getting messed up by a old man berely breaking a sweat ............well really not even breaking a sweat .
If by losing makes you more powerful than so be it !
Where could you have possibly gotten that? Leia wasn't an official Jedi. She stopped because it was messing with her Political/Diplomat Job.