Tenant moving out early. How do I handle this?

[Jordin Boyd]

My tenant is moving out early and forfeiting her deposit. I need to put an ad up to get the place rented as soon as she is out. Should I send some kind of official statement/document that indicates we agree on the date she will be moved out? I don't want to get a new tenant lined up and then have the current tenant change her mind and want to stay... Any suggestions? How do I handle this?

Thanks in advance