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If it converts to a month to month per the terms of the lease, the other lease terms will control, as will the notice. But if the lease is silent as to this fact, there will only be a 15 day notice period to terminate the tenancy. That is, 15 days notice prior to the end of any monthly period that either party will terminate.
As for the security deposit, that will stay until the termination of the tenancy, and you can make a claim against that after she moves out.
The fact that it converts to a month to month does not change the deposit, which is not dependent upon what type of lease it is. The deposit only has to be returned (or deducted) upon the tenant vacating the premises, not the end of the lease term.
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