Hi onlyitj. welcome to Psych Central. I am sorry you are not feeling safe due to invasive thoughts present in your wife. It sounds like she is not having a grip on reality or a strong sense of wanting to keep her family safe.
Since they have a professional, you may want to reach out to them and tell them the kind of thoughts she is having. This would let them decide if she needs a med change or possibly hospitalization in the case where she is a real danger to others or herself.
If the doc does not do anything, you may want to consider a change of doctors or an ER visit if things get out of control. The police are usually a last resort, but if you and the kids are threatened, it may be needed.
If you have family that might take care of the kids maybe that would help to have them out of the front lines. Maybe sleeping in different rooms behind a secured door might help you sleep better.
These articles may be of interest
Living with Schizoaffective Disorder: Myths, Facts, and Prospects
Caring for Someone Living with Schizoaffective Disorder – Bridges to Recovery
Living with Schizoaffective Disorder