She doesn't need to evict them. She can just ask them to leave and call the police if they don't. There is no landlord/tenant relationship here. She allowed them to stay as her guests. They are no longer welcome. Legally she can tell them to go. The police may not be happy to get involved as this is technically a "civil" matter. If that is the case then she can still ask Family or friends to intervene and get rid of them. I hope that helps. Please leave a positive rating so that I am credited for my time.