S.B.
Just to give some perspective, my grandmother (dad's mom) had schizophrenia. She had six grandchildren; all of us are now adults; none of us have schizophrenia or serious mental illness (thank goodness).
Please consider doing two things: First, for your own sake, talk to a pediatric psychiatrist to discuss your concerns and get some sound information about schizophrenia and what it looks like in children. Along with giving you perspective that not all kids with the family history will get it, and not all kids who have this behavior at 7 months have it, it should help you feel a little more in control of the situation.
Second, talk to her pediatrician about her sleep issues and crying issues. Other things may be going on that can be addressed. If the pediatrician dismisses it, get a second opinion (maybe from a developmental pediatrician). All this may cost extra money; however, it may be worth it if it helps.