"She got it from her brothers friend"
So, what has she said to her brother? And, what did he say to his "friend"?!
She shouldn't have sold it, but should have contacted the seller, insisted on a full refund, and, if he balked, gone to small claims court with all her evidence. In some states, such obvious fraud can result in *double* damages... so, she would have made money and cost the ne'er-do-well a pretty penny.
If the brother doesn't back her, insist on his supposed friend making up the difference, and, then, drop this supposed friend who ripped off his sister, she should sever relations with her brother, too.
Sincerely,
Miss Manners, Dear Carolyn, or Ask Amy