"Keep My Deposit"

[Sarah Martin]

I had a month to month tenant in California move out without warning on the 4th in order to avoid paying rent on the 5th. 

She told me to keep her deposit ($450),  to cover her moving out and a hole that was left in the wall.  Do I still need to send her a disposition of deposit?  Do I need to itemize the repairs and cleaning needed or is the fact that the lease was broken without warning enough to justify keeping the deposit?