See my post 35.
I don't think this is childhood-onset, more likely adult onset.
Very intelligent schizophrenics have more resources to keep the disorder in abeyance, they deliberately hide odd thought processes from others (knowing that they are perceived as weird), and, when life is good, they often can behave completely normal. But when stressors become too much to bear , or when an obsession (based usually upon a delusion) becomes unusually strong, they will act out both their grandiose and persecutory delusions.
Often they have a single, fixed ideation (which is what this woman seems to have), which can be very powerful in compelling bizarre behavior.
But you are right, the highly intelligent and passably "normal" schizophrenics all seem to be of the paranoid variety. I have a friend of some four decade's acquaintance who suffered adult onset paranoid schizophrenia. He'll call me every month or so. The entire conservation will be completely normal. And then he'll start complaining about the person who lives in the apartment below him, or above him, who is always following him from room to room and thumping the floor or ceiling to disturb him and keep him awake.
Sounds mildly plausible unless you know that he's lived in perhaps two dozen different places in six years and had the same complaint in every apartment.