I'm certain that if the “new,” reincarnated saintess who knows the “original story” is evil, this will be a part of what finally trips her up. She'll try to use this exact scenario to frame Rachel as a last resort, and succeed only in making a clown out of herself, since the current Rachel wouldn't be able to use any magic.
Well, that's assuming that the fact that Rachel has lost all of her magic would be kept a secret, or that the saintess would somehow remain oblivious to it. Though, I honestly wouldn't be surprised if she remained oblivious even if it wasn't kept a secret, since the reincarnated white lotus bitches are usually stupid as hell, using ONLY their knowledge of the original story, nothing else.