Here is a link to the full and current Buyer/Seller protection policy:

https://www.paypal.com/webapps/mpp/ua/useragreement-full#Schedule_1_PayPal_Seller_and_Buyer_Protecti...

Under those policies, the buyer is eligible to open a SNAD dispute as it doesn't exclude off-eBay purchases in any way (that doesn't mean her claim is valid, just that her purchase is eligible for the protection).