She didn't die , If u get the TRUE ENDING , Ayumi will go back to her dad and be free , so she won't die :')
You'll find the sequence if you back away during the simon says game and then block and copy the text on the side and run it through a decoder. You should get a diary entry say what you need to press in what order during the hide and seek game and once you click the sequence you will also get a clue to the true ending.