If she were to call the police and say that she thought you were a danger to yourself, they would probably send some people over to assess the situation. If that happens, just be honest and say that you do cut yourself at times, but that you are not suicidal. (Assuming that’s the case.) They don’t go around committing people just based on hearsay. Of course if a doctor or therapist/counselor called them, they would take that a lot more seriously. I also live in California. I’m sorry you’re having to go through all of this. I hope you can find a way to get out of your mom’s house. In the meantime, do you have a therapist or someone to talk to?