Thank you. Even though the guest is paying nothing, the guest is deemed to be a month to month tenant. As such you can only terminate the tenancy by giving written notice of at least 30 days. If she does not leave voluntarily, under CA law, you will then need to give a 3-Day Notice to Quit...meaning the guest must vacate the premises within that period or face formal eviction. Then, if your guest still has not left, you must file a petition for an eviction order. Once that is granted...you can have the sheriff evict. Unfortunately, what you cannot legally do is move your guest's stuff out, change the locks, or avail yourself of any other means of "self-help" eviction.
I hope this has given you the guidance you were seeking. I wish you the best of luck!
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The information given here is not legal advice. As all states have different intricacies in their laws, the information given is general only. This communication does not establish an attorney-client relationship with you. I hope this answer has been helpful to you.