How much performance is Training vs natural ability?

Probably a significant amount, but as others have said, it’s impossible to tell.

There was a 13 year old girl I coached who ran 13.49 and long jumped 4.76 after 4 practices. Her 4.76 was off the “wrong” foot, after accidentally starting her run-up with the different foot. I decided that wasn’t the “wrong” foot after all.