I'm happy to see Corín Tellado there. Her works were always downplayed because of the genre (romantic pulp short novels, female public oriented) but she really worked her ass off to write more than 4000 books, and was quite popular with certain demographics, and sold more than 400 million books.

Single mother of two (her husband didn't want to take care of their children and left her alone) she could write a book in less than a week ¡!