Unauthorized occupant of rental property

[Debra Hamren]

To make a long story short, we had a tenant who let a friend and her 4 children stay with him temporarily in our single family rental property. Our month to month rental agreement states the premises is to be occupied by our tenant only and no subletting or assigning. He has since been evicted, but she refuses to leave. We've served her a 30-day notice to quit, but she still will not leave. We've  hired an attorney to file an unlawful detainer. She has a criminal record and we do not want her in our rental. I've been trying to research the landlord/tenant laws, but I haven't been able to find any information on our circumstances. Everything I've read is in regards to tenants who have paid rent or who have signed rental agreements. She has done neither of these. The 30 days expires today and we are filing an unlawful detainer tomorrow.  I just want to be sure we do everything correctly to get her out. Does she have any kind of legal rights to fight us with?