Close your computer completely.
Take a walk.
When you come back, try again.
How long has it been since your purchase? Until January 2015, eBay only allowed 45 days for a Dispute.
Or forget using eBay entirely for the refund and go to the credit card you back your PP account with , phone the 1-800 customer service number and ask the clerk about a chargeback.
Have all your paperwork (dates, transaction numbers, payments, currency, etc) handy to help her process your refund.