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She was what is termed a "tenant at sufferance" when she lived with you, so landlord/tenant law applies even if she was not paying rent.
Per Civil Code § 1983 et seq, the landlord must send a notice to the place the tenant is expected to receive it that (1) describes the property in sufficient detail for the tenant to identify it, (2) advises him that he has 15 days (18 days if the notice is mailed) to claim it, (3) appraises him of reasonable storage costs, and (4) tells him where to claim the property.
The notice must also inform him that unclaimed property of value will be sold at a public sale and property believed to be worth less than $300 will be kept, sold, or destroyed.
After deductions for storage, advertising, and the sale, landlords must turn over to the county any residual proceeds.
So that may be done, but only after she receives proper notice in writing and does not pick up the items before the deadline.
Let me know if you need a sample letter.
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