Well neither is manipulating the princess to get to the highest echelons of Equestrian power, nothing has been said about her raiding the Canterlot Secret Forbidden Library (if your talking about Starswirl's spell that she got it's never even implied where she gt that so that's nothing more than a theroy with little concrete evidence), Twilight casually time traveled too without authorization too back in season 2 so one can assume that's something that's encouraged not to do rather than enforced. And that "almost destroying all of creation over a petty grudge she use to have as a filly" is so exaggerated that it might as well be made up. She changed the past to get back at Twilight for destroying what she worked hard to create (her village) on top of that destroying all of creation was never her plan (that's why she stopped albeit with immense denial). So her "childhood grudge" (if you can even call it that) has nothing to do with her time travel plan or at least it wasn't her motivation. What you described in that last part there is closer to Tempest more than Starlight