Thanks for your question today. Your situation is at the moment primarily a property dispute.
If you provide some information as to ownership and tenancy rights, I will be in a better situation to assess your situation. This is a landlord- tenant law/ property law for your information.
So let me know: Who is the owner of the property ?
Has she paid any rent ?
Is there any written agreement ?
If she is a tenant in law: pays rent and has signed an agreement,it will be difficult to evict her.
You will need to follow local landlord-tenant rules, that include serving proper eviction notices on her.
You can do that yourself or consult a general practice lawyer in your County.
Otherwise, if she is just a guest, she wouldn't have any rights and you only need to change the locks when she is away.
If this answers your question, please rate five stars.
If you need more information, follow up with me with more information.