The sickly, iron-fisted beauty in Harry Potter

He traveled through time to become Harry Potter's older cousin—
No, now it's little cousin Dolly.
However, Dolly wasn't shocked by the time travel for a moment; she had to face a big problem.
She awakened the golden finger that every time traveler needs.
Good news! This system allows her to become a wizard and enjoy an extraordinary life.
Bad news, this cheat code requires a lot of time and effort.
[Paying blood, organs, or even lifespan can earn skill points that enhance all attributes and items.]
Clearly marked prices, fair transactions, and honest dealings with everyone.
Looking at the tempting reward and feeling the longing for magic in her heart, Dolly didn't hesitate to click the system's close button.
Magic may be wonderful, but nothing is more important than your own life.
After all, as Harry's family member, Dolly wasn't without the right to visit Hogwarts.
Instead of wasting your life learning magic, why not seize the opportunities of the times and enjoy life to the fullest?
However, just as the system was about to shut down, Dolly suddenly remembered something.
"Um, System Sister, can I use the Snowflake Cotton accumulated in my body to buy it?"