I think this drives her more to being a stronger character and being able to stand on her own.
You know, a "never again" type mentality.
I just envision her holding the north and all little fingers accomplishments after she kills him when she realizes he's evil as fug in the show world
He's also stupid as fug in the show world. Can you imagine book Littlefinger having no idea that Ramsey Snow is crazy and just assuming it's fine to marry Sansa to him, hinging the entirety of his plans on that going well?