I think it's early yet (I know that's not what you want to hear). When DH and I met, his belief system was that monthly car payments are an inevitable part of life, that personal loans are a useful financial tool, and that he was being financially smart by paying an extra $100 a month on his $6,000 credit card bill.
Eventually, as he saw me paying off debt, he started to get a little more aggressive on the credit card. The more he saw the balance drop, the more motivated he got. He planned to pay the personal loan and car payments on schedule. Since they weren't credit cards they "weren't the bad kind of debt." I pushed a little, but not too hard
A funny thing happened when the card balance was at $0 though. He saw that it was much easier to pay off than he'd ever dreamed, so he went ahead and got to work on his personal loan. Once that was paid, he started thinking "Hmmm.... how cool would it be to drive a paid for car?" And now his car payment is next in his sights.
I guess it's kind of like weight loss. Some people can think "A pound of fat is 3500 calories, so if I eat 2,000 calories a day and burn 3000 calories, I will lose roughly 2 pounds a week." Some people have to eat the grilled chicken breast, drag their ass to the gym, step on the scale, and see the numbers drop.
Perhaps if she works hard on paying down the card, she'll start to see the light at the end of the tunnel and see that it's not as impossible as she thought.