Call PP and tell them you are returning the bag to the seller and that you need the address she has on file with them. Although, SOMEONE PLEASE CHIME IN HERE, I believe at this point and the way this transaction is going, you should really be confirming with eBay what her address is. Any time I ever did a return or exchange on eBay (only two, but either way), I always went by the address they had on file with eBay. I hope someone will add detail, but that's what I did.
Thanks, GlamGirly! I'll call eBay as the sale did go through eBay, then Paypal. I appreciate your advice!