Slytherin's Shame (or Pride?)

Diana Dursley, who lives at 4 Privet Drive, doesn't pretend for a minute that she lives in a normal family. If her crazy father, gossip-obsessed mother and spoiled brother wouldn't be strange enough, you just have to mention his strange cousin, Harry Potter.
The Harry Potter who is a wizard. The one who survived the killing curse and who is known by everyone in the wizarding world.
In light of this, Harry may seem like the strangest resident of Privet Drive, yet Diana considers him her most normal relative. She sometimes gets into conflicts with her parents and brother, but otherwise she lives her life like a regular Muggle, and has no reason to complain.
Her cousin returns home from his first year at Hogwarts School of Witchcraft and Wizardry, full of excitement and experiences. Diana listens to his stories about the wizarding world with interest. However, due to an unexpected incident, Harry runs away from home, so the rest of the summer is boring for the girl.
However, the first of September that year has something else in store for her than the start of high school and her eleventh birthday. She receives a mysteriously late letter from Hogwarts, which ensures that she will never have to be bored again in her life. However, she is completely unprepared for the fact that her fate will connect her with the Horned Serpent from the legends of Ilvermorny, the American wizarding school.

All credit goes to Sarah Ross, the original writer of the book, I'm just attempting to translate it. Also, sorry for any grammatical errors, I hope you enjoy it