The super sekret is why Kylo spared her to begin with, while killing one of his own guys in the process. And seeming to be so sure that a mention of a random girl on Jakku was HER that he threw a bitch fit.
They could also do some mic drop shit like reveal that a Jedi ghost has been guiding her from the moment she "awakened." Cheesy? Yes. Awesome? Definitely. The movie used Obi-Wan's voice already, sure, but now she has Qui-Gon hair.
Any tidbit to play down the mary sue "instant jedi tookit" stuff.
On a rewatch, her owning Kylo during the mind-rape is still awesome. And lol at yanking grandpa's child murder saber right past his nose.