Meaning: The girl loved the doll very much and kept it for a long time.
Choice of Words: "Cherished" means to hold something dear and valuable, often with a deep affection. "Doll" refers to the toy figure. "Forever" means for an无限long time, without end. Putting these together, "Girl cherished doll forever" indicates the girl held the doll in high regard and valued its presence in her life indefinitely.