The Corrupted Doll

(Y/n) was created to protect his beloved adopted daughter, Sally, but there was something wrong with (y/n), she's an enchanted doll. She comes to life every time its cold each year, but no one knows but HIM and her creator. Will someone find out about her secret? Will they protect it? Will she finally be able to take over control?
Oh did I forget to mention she's an important weapon with a bad temper?