Tenant moving out, trying to keep rent

[Tyler Mutch]

Hello All, 

I gave a tenant their 30 day notice 40 days ahead of time, the lease is set to expire on the 15th of March. She is claiming that she does not want/need to pay for the month of March( due on the 5th) because she wasn't for any point in the month. She took the liberty of moving out early, and is now claiming that she won't pay and expects the full deposit back. Does any one have any advice or input ? 

Thanks!