International Student Loan - Cosigner is Dead

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My old classmate and good friend got in touch with me with a unique situation. I thought here would be the best place to get an answer -

She was an international student with a cosigner (US citizen). I think the amount was about $40,000. She had to go back to her country after losing her job. When she got back, her cosigner died of a stroke (around 8 months ago). She continues to pay the loan instalments, but she's running out of money. Questions -

1. If she cannot continue paying back the loan, what happens? Who is liable? The estate of the dead person has already been divided amongst his survivors.

2. Can she be extradited to the U.S. if the bank/loaning organization decides to carry out proceedings?
[My personal take on this one was that since law enforcement cannot be involved on a defaulted loan, there really cannot be an extradition. Not sure though.]

3. The person who died is survived by 2 sons. Does this unpaid loan end up hurting their credit history or in any other way?

Thanks.

Best,
Tim.

[Mr. Knowitall]

1. She borrowed the money. She's liable. (You needed to ask?)

2. No.

3. No.