Sometimes, it's the nature of the type of leather to scratch.
Is this the listing?
http://www.ebay.com/itm/NWT-COACH-LIMITED-EDITION-PINNACLE-LEATHER-BETTE-/321047615253?pt=US_CSA_WH_Handbags&hash=item4abfedd715&nma=true&si=2w78y9UA9wct5EEUywntC9yktT4%3D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557
Based on the placement of the tag, it appears to have been a floor model, subject to handling by customers. But again, it's also a type of leather where minor scratches will show and even if you received it directly from the factory, it could come like that just because of the type of leather it is.
If that's the listing and if I were the seller, there's no way I'd agree to a partial. The bag is absolutely NWT, as described and rare and I'd rather take the bag back and issue a refund.
She'll be able to resell it, perhaps for more money because it's so hard to find the color.
I'm not saying you're doing this, but many sellers are averse to giving partials because it's become a common tactic for buyers to find "flaws" and request partial refunds as a way to get items cheaper.