If you properly documented the cleaning and repair costs under Civil Code Section 1950.5 you should owe nothing and will prevail in a small claims lawsuit.
Damages if you lose are only twice the amount withheld, not three times as suggested by my colleague.
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If you don't think that she deserves the money back, then you should contest her story. If you have pictures of the damages, as well as invoices from your vendors and contractors, that will be good proof. Be aware, however, that if a tenant is able to show that a landlord improperly held their security deposit, they can be awarded damages of three times the amount withheld.