When there is a fixed term lease agreement, unfortunately the landlord cannot terminate the tenancy based on the reason that the landlord will be moving in. That can only be done at the end of the lease term. All you can do is try to have the tenant agree to terminate the lease early and if she does agree, you would have her sign the Form N11- Agreement to Terminate a Tenancy. If she does not agree to leave and she is causing problems for the other tenants you can serve her with a form N5 notice.