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KBB is overinflated by as much as 70%, and I don't think anyone will loan as much as $8,000 with a car (a depreciating item) as collateral. Probably more like $2,000 or even $3,000 would be realistic.
I doubt that big banks and credit unions make loans using cars as collateral (not referring to an initial auto loan or refinance situation here), as they would stand to lose on the proposition from a financial standpoint. Probably some secondary (and very likely predatory) lender with very high interest rates is what she would be looking at.
Someone else who has been in that situation may be able to help you more. I'm answering based on information from reading and research, and not from personal experience, so there may be someone else with firsthand experience who can help.
I personally think it's a risk for her to get a loan against her car. I've never had one, but have heard that the interest rates can be very high and the risk of her losing her car if something unexpected happens is real.
I'm also a bit confused as to how she paid off a $24,000 car loan in a year and a half, but has outstanding credit card debt (higher interest than the car loan) that she is having difficulty paying.
Thank you for the updated information.