The landlord is correct that you are under a duty to make sure that any of your “guests” removes their belongings from the property and remove themselves from the property.
Having said that, if she refuses, I would simply walk away from it and tell the landlord to pursue her for it. If the landlord takes you to court then you need to defend the action on the basis that you have no control over this trespasser.
Actually trespassing in residential property has been a criminal offence since 2015 but the police will not do anything about this even though you have withdrawn consent. It isn’t even worth making the complaint.
However this person has presumably never paid rent and as such, they are simply a guest in the house, your house and you are actually entitled to simply lock them out without notice. They are no different than the postman or man across the road popped over for a cup of tea. It’s just that this person popped over for a cup of tea and stayed for a protracted period of time.
You do have to give the belongings back though.
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