Under the laws of all states in this country, if your presumed written lease does not have a contractual provision within it restricting the visitors that you may have at the rental you occupy, what the landlord is attempting to do is not allowed.If your landlord is becoming difficult with you concerning the vitiation issue, I suggest that you consult with a landlord tenant attorney about the situation and the possibility of filing a petition for a restraining order with respect to her bad "behavior".