Zelda didn't create this rite of passage. She was merely sticking to tradition. I also got the impression that she liked Link regardless of the turn-out. Actually scratch that, it was plainly evident.
I know she didn't create it. Yes she was sticking to tradition. She was also talking way too much about Link failing at the beginning. I mean honestly, she came off as a bit of a jerk in some of the scenes at the beginning.