I Was Transmigrated As An Extraordinary Extra

Adelaine Hammond transmigrated inside her own unfinished novel. New identity, new world, new everything. She became Remillia Lockhart, a character she didn't know of. In simple terms, an extra. She became an extra in her own novel. She became a Hero, fighting monsters, making enemies, and also why is she having love interests?? However the novel she once wrote of is becoming different and more strange. The Monsters are more stronger, new enemies, series of events that she did not even write, and how come she's getting stronger than the original MC's? She must find a way to survive and get out of this damned novel.