Hello, I'd like to help you with your question.
If your wife is not willing to get help, it can be very frustrating. Getting someone to get treatment when they refuse is always difficult, especially when dealing with an adult that you have no control over. You want them to see the importance of taking care of themselves but for some reason, they refuse. It can be upsetting when you care about the person and they will not listen. You can see what they are going through, but they are not willing to address any of their own issues so they can recover. There is hope for your wife as long as she will follow through with treatment. But for the sake of your children, you may want to talk to a counselor with your children in order to cope with your wife's mental illness. You may also want to consider keeping them safe by making other housing arrangements until your wife is stable.
To file a 302, which is an legal document ordering an involuntary commitment for inpatient mental health treatment, you can contact your local ER. They will provide instructions on how to file the 302 and either have you transport your wife to the ER for an evaluation, or they will send the police to escort her if she is not willing to go. The person seeing the behavior must be the one to file. No one else can. Your wife would be committed for a period of time, usually 72 hours then her case would be re evaluated by the doctors and courts. They can either keep her for a longer time or release her for follow up with a local treatment center.
Here are some other resources to help you with ideas on how to help your wife:
I Am Not Sick I Don't Need Help: How to Help Someone with Mental Illness Accept Treatment-Xavier Amador.
You can also contact NAMI at nami.org for assistance for your family on how to handle your wife's situation.
I hope this has helped you,