Last Months Rent? Need Help.

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My tenant is on a month to month lease. She paid first and last plus deposit when she moved in 10/06. She paid Feb/07 rent on Jan 31/07. Today 02/07/2007 she gave me thirty day notice and wants to tentatively move out around 03/07/07. She is wondering what will happened to the "extra” rent she paid. The way I see it she did not pay an "extra" month of rent; she has paid for Feb/07 and the "Last Month" rent she paid at move in covers her rent until 03/31/2007 (or is it 04/07/2007). In a nut shell she PAID last months rent so no refund.

Am I correct? If so how do i explain this to the tenant. If I am not correct please explain it to me and provide suggestions as to what I should do.

Vancouver, WA