First off, in 2007, 9% APR was not bad. It still isnt. That may have been the best rate she qualified for at the time.
Second, the reason she owes so much is because she undoubtedly financed taxes, fees, and extras like warranty. Did she have a trade in? Did she owe more than it was worth? Well she is still paying off that shortfall too.
Lastly, the other answers told you what will happen. They will sell your car at auction. Whatever it brings will be deducted from the balance of your loan. You will still have to pay the shortfall between payoff and auction. They will add repo fees, legal fees, storage, transport and auction fees. PLus a fee for all the fees they have to process.
You will have to pay that balance. They will have the right to sue in court, and request a garnishment of your wages until the balance is satisfied. They will turn it over to collections agents, who will pester you night and day.
You will, in effect, still be paying for a car you no longer have the priveledge of driving.
This repo will be on your credit for a *MINIMUM* of 7 years. The way reporting works, is that the item will come off the bureau 7 years "after the last action". That means if you pay it off in 2012 (last payment is the last action), the negative will be there until 2019.
If you think she got hosed at 9%,. wait til you see the APR for someone with a repo!