How do you open an item not recieved dispute?

[jimblejambles]

My mum bought something on 19th August and has heard nothing from the seller despite emailing a couple of times.
Does she open a dispute on ebay or does she have to do it through paypal?

[sixlostmonkeys]

this should help

pages.ebay.co.uk/help/buy/item-not-received.html