What is the way to get rid of masturbation after repeatedly repenting and returning to it, especially after committing it during the daytime in Ramadan? And how does a girl expiate this sin?

No matter how great the sin, Allah accepts repentance; rather, He rejoices in it, loves those who repent, and transforms their evil deeds into good ones. Repentance involves abandoning the sin, regretting having committed it, and resolving not to return to it. No matter how often the sin is repeated and repentance is repeated, it is accepted, as Allah Almighty says: "Indeed, Allah loves those who are constantly repentant." So hasten to repent, beware of the whisperings of Satan, have a good opinion of your Lord, occupy your time with what benefits you, and frequently remember and supplicate Allah.