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"1.So, the judgement owner can't garnish her wages now, but can they if she gets a job? "
yes. There is a limitation on enforcement of judgments, and it depends on what state she lives in and what court the judgment was obtained in, but it's commonly between ten and twenty years.
"2.How would they know she got a job? "
If she told them. There is a procedure for calling the judgment debtor in before a judge, notary, or other officer to answer questions about the judgment debtor's estate. It's common to demand that the judgment debtor bring along documents, like tax statements, bank statements, cancelled checks, utility bills, etc. If that happens, they'll find out about the job. And the bank accounts.
"3.Can they get into her bank accounts and with draw money? "
Yes, that's also a garnishment. I've discussed the idea of garnishment at some length elsewhere on this website, which you can find using the search function. But remember that the gist of a bank account isn't storage of your cash, it's a loan to the bank. So if A owes money to B and B owes money to C, then the court can order A to pay C directly. In this case, A is the bank (or any other person who owes B money), B is the sister, and C is the judgment creditor.
"4.If she marries can the new husband be made legally responsible to pay the judgement? "
Absolutely not.
"5.If she just wants to bankrupt this judgement, will it go away for ever? "
Yes, but you can't bankrupt a particular judgment. You can do a general assignment for the benefit of creditors, a state law equivalent, or a homestead deed up to the limit allowed in the state, but if a chapter 7 bankruptcy is filed, all of the debts that can be erased will be. And, by the way, once the debt is converted into a judgment, it's no longer "credit card debt", it's a judgment. Chapter 13 on the other hand is a forced payment plan, in which you agree to repay at a particular percentage, and the creditors have to take what they get and be happy with it. Chapter 13, or "personal reorganization" is different from chapter 7 or "bankruptcy" because you have to actually repay the debts, but it only works with people with sufficient assets to cover the plan.