I haven't play in a while but you can go back to the previous chapter if you already reach chapter two and you miss some of her training (there is one that has to be in chapter one if I am not wrong.). To do that, you need to activate cheat by going to the menu and click the top right icon that ask you not to press it. clicking it will give you a warning. countinue to click it (3 times if i recall) to unlock the cheat menu. From there you can go back to chapter one setting and other stuff.
hope this helps