each persons system is set up how ever they needed to survive. each alter has their own sense of agency (what their jobs, purposes, reasons for being created and much more like how they are in the world where they fit in....) my point is that if an alter doesnt know about the others then they also will not have access to others journals.

DID is not something that just comes on a person, a person diagnosed with DID is that way since very early childhood, the demographics statistics in my location document before the age of 5.

now put that into an adult living with DID. their alters have already been doing things like writing, drawing, shopping, cleaning, paying bills you name it. so if a person has alters that do not know about each other the system already has a built in way of doing things so that the others do not find the things others have bought, the things that the others have done said and all including writing out bills, doing homework for elementary, jr hi high school college, work...

see what I mean if a person gets to adulthood and their alters dont know about each other already with all that goes on since very early childhood to adult hood (think about all the times in your life time you have had to take pen and paper in hand and write something down since as far back as you remember) DID isnt a situation where a person never in their whole life time has never wrote down anything, never signed their names, never did homework, never wrote anyone any emails or letters, sent special occasion cards...

everything a person with DID goes through is already happening all their whole lifetime. getting the diagnosis doesnt change anything other than puts a name to whats already been going on.

you can relax. your friend can continue to write her thoughts and any other writing she has done through out her lifetime, just like she has been doing her whole lifetime. when her system decides its time to reach that part of healing where alters share their writings then it will happen until then secrets are safe simply because of the dynamics of how DID and each persons system works.