No. Obviously, the credit card issuer will have records, but that information is not generally reflected on the statements. Of course, I'm not familiar with every credit card issuer's practices, so I can't categorically rule out the possibility that some of them include that information on statements, but it's certainly not the general practice in the industry.
Bottom line: She'll have to prove the obligation to the satisfaction of whomever administers the estate of the deceased ex-BF (if any administration actually occurs) or sue the estate, in which case she'll have to prove the obligation to the satisfaction of the small claims judge.
Possibly because she was never on the title. The BF bought the bike in his own name with a down payment from the credit card and financed the rest. The finance company either held the title or put a lien on the title and when the loan was paid, released the title or the lien to the buyer. The GF would have had no say in that and just got stuck with the balance on the credit card.
If you did, you would sue "The Estate of ________." The problem there is that the estate may have no money left after paying secured debts and priority debts. You might not find that out until after you win a judgment (if you win) and the judgment ends up being uncollectible.
