What should I do with her stuff?

If I lose contact with my old friend, what should I do with the stuff that I have for her? It was expensive and there’s no other friend her size who could wear it. Should I just post it to her mum’s address? Or should I donate it to the secondhand store and give the stuff that’s not clothes to other friends? I don’t know this etiquette. I have Asperger’s syndrome.

What should I do with her stuff?
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