It may be for the best if you can't access your daughter's journals and other files because they likely contain thoughts and information that she intended to be private. Imagine if she were here today and you were to ask her if she'd mind if you accessed all her files -- my guess is that any young adult would be mortified to know that a parent, no matter how beloved, would be reading their private thoughts and seeing their private pictures. While I do understand your desire to gain as much insight as possible into what happened, realize that nothing you would read or see will change the very tragic outcome. I am truly sorry for your loss -- and your partner's -- but please consider it a blessing that Apple's security will help you honor what likely would have been this young person's wishes.