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She needs to file for an emergency temporary custody/visitation order.
Here is the form that she needs:
FL-305 Temporary Emergency (Ex Parte) Orders - California Courts
The form is available on the Court's Self Help Website.
She should do this as soon as possible.
Also, this is a sign that he will no longer be cooperative. While she can file this form herself, she should start looking for an attorney as soon as possible.