Deposit and notice from tenant

Tenancy Deposits

I guess you have had a good tenant for five years, so basically the decision is yours as to what you decide to do!
However - generally the deposit cannot be used for last months rent - it should be kept back to pay for any damage/delapidation not considered fair wear and tear.
You may wish to start looking for a new tenant - obviously they are going to want to know when they can move in!! If your existing tenant "may decide" to stay on a week or two then you are stuffed - You should be firm and tell her that the end date is the end date, come what may. Get her to agree final move out date which cannot be changed.And get any addtional rent in advance. I should imagine her new landlord will not be impressed if she moves over two weeks late - will he accept that, I wonder??