Hi,
The seller shold send within the despatch time they have on their listing (in the P&P section). If they want to be eligible for Seller Protection then they should post the item within 7 days of receiving cleared payment.
You can open an Item Not Received dispute via the Resolution Centre 3 days after the estimated delivery date shown on the listing.
Unless they have had unforeseen complications, don't understand why they can't get the P.O., or perhaps ask someone to send it for her!

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