martian, i thought that onset of schizophrenia was accompanied by milder hallucinations, kind of like shooting spots in the eyes... hallucinations of this calibur would most likely have to be a serious stage already.
The disease comes in 3 types:
http://psychcentral.com/library/schizo_subtypes.htm
that link should give you a good set of symptoms, but i think if that this is the case you would have noticed sooner.
by the way, to elaborate on what martian said: if she acts emotionaly devoid, that would point at disorganized schizophrenia.