Board Thread:Boruto Discussions/@comment-25547449-20160915085133/@comment-734582-20160915183730

Actionmanrandell wrote: another option is that maybe with the combined power of her byakugan and Rinne sharingan, maybe she forsaw the possiblity that she would go insane Doubtful, as she simply would've prevented her insanity.

It's more logically either a correspondence or a diary.