Here's my theory...
I think she had some kind of traumatic event, possibly her parents divorcing and her Mom remarrying or something more serious.
People respond to life events very strangely. I have friends that have had awful things happen in their lives but they carry on. Others have events that I feel are bumps in the road, yet they are destroyed forever.
Any how, after the trauma she decides she is going to separate herself from family and in the missing two years I think she met someone that led an adventurous, wild life that appealed to her. Maybe she moved around with this person. I have this idea of the type of friend that always has a new plan but nothing really ever pans out. One week they are modeling, the next working at a strip club and living here for a bit, there for a bit.
I think this friend knew or knew someone who knew Ben Perkins and he helped her get a new identity. People have found some of his shady dealings so it wouldn't surprise me if he was involved in helping people get new identities.
If my theory is correct the notes page could be a combination of her notes and the friends notes.
Hopefully someone who knew her between 1986-1988 comes forward. Or if she had a close friend from before she left her family, we might get some details.