I think there may be a forum for schizophrenia which you can check under forums and it is alphabetical. Are you sure she is taking her meds? It sounds like either she isn't or is skipping or maybe the meds aren't working. She may need a higher dose or an additional pill that compliments the other. I hope that you can get this solved. Be careful if she gets violent.
I would check the detailed side effects of the medication she is taking and speak with her doctor if that is permitted. She may need a change.
I agree I would say it could be side effects of the med she is taking ...ask for a reevaluation