[Harry Potter] A Pure-blood Gift

Elena's life after transmigrating doesn't follow the usual path. She transmigrates into the world of HP, but the story has already ended. Other transmigrators get summoned beasts, but Elena was summoned and brought here by Elena herself. Other transmigrators get a pocket dimension, but all she has is a computer and a car from ten years in the future. She transmigrated as a Muggle-born girl with dead parents, a car, and a house, yet she ended up in Slytherin. She was a Muggle-born Slytherin who was ostracized, yet she became Sirius's adopted daughter, Harry's sister, and even an acting professor. The war is over, the world is at peace, and everyone is singing, dancing, and playing games, yet suddenly someone starts hunting her for no apparent reason. She thought she was a Muggle-born witch with amnesia, but it turns out she's a little enemy boss of the Church, the Chosen One entrusted with Salazar's thousand-year mission. What's our goal? Create a new wizard Pure-blood line? Give away new wizard Pure-blood lines? Help ensure the survival of wizards? This is all so confusing! Somehow she's become an even more powerful The Chosen One than Harry! So now, to complete her mission, she has to diligently seek out one new bloodline after another, all waiting to be claimed. ...Let's not tell her she actually transmigrated here to hook up with the platinum-haired dragon, okay? Pure-bloods, fresh off the press! Elena really wants to shout that. But in reality, she can only work like a busy little bee... Running all over the world after one fascinating new bloodline after another... Poor girl. All because Slytherin once saved someone's life, not hers, she has to bow to fate and track down those "bloodlines" that have been waiting for hundreds, even thousands of years. A baffling transmigration; a baffling Sorting; It all seems to have happened out of nowhere, and yet perhaps it was fated all along. Elena Irvanks. This is a new life. Hogwarts, the first step and first stop in this new life, the starting point for everything new... In the end, it seems fate has given her an important mission, too. A transmigrated girl's life is hard... She can only force herself to perk up and shout: ...Free new Pure-blood lines for the taking! As long as you're a wizard and I like the look of you...