Is she in therapy? Is she willing to do therapy? Would she let you go with her. There's injections that can be given 4x a year. Medicine doesn't have to have horrible side effects. See if she can get genetic testing to see what meds work the best. If she does the injection you may want to drive her. Because it's scary especially when paranoid.

As for the paranoid thoughts ask her what you can do. Validate that it must be scary