Hi, thank you for your question. It would not be in your interest to reclaim the property or change the locks until her notice period has expired. Legally, she has a right to remain in the property until expiration of the notice period. If you were to reclaim the property or change the locks she could potentially have a claim against you for unlawful eviction.
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The deposit will be covered under the tenancy deposit scheme (if you had protected it) and you can take your losses from there by following their procedures.