You had 45 days from end of sale to file an item not received dispute either through Paypal or through ebay.
"I contacted with the seller and the seller said she would resend my item but it didn't come again. "
Based on that statement, I am assuming your seller is in China. It is not uncommon for sellers in China to tell the buyer that they will "re-send" the item. This is a tactic to get the buyer to wait past the deadline to file a dispute.
Sorry but you have no recourse. It's too late to file a dispute, a chargeback and to leave feedback.
Don't be surprised if this happens again if you continue to buy from China, the counterfeit and inferior product capital of the world.
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Non payers should get unpaid item strikes and be added to block bidders lists. Period.