Yes, she would be wasting time in History class, but she would also be missing Mathematics class or Physics class, Chemistry or Biology class. God forbid economics (if they teach that in USA). Being good developer is also about able to write out articles, so English class does help there. The OP is privy to his situation more than I am so, I give a lot of benefit of doubt, I would not let my daughter quit unless she is solving real world problems and making some real dough off of it. That would be the standard I would aspire for dropping out of High school. Now College is a different story, I do not recommend if the person is already proficient coder.