Does filing for bankruptcy affect what is owed in a judgment or to the IRS?

My mom is thinking about filing for bankruptcy since she's up to her eyeballs in credit card debt, not to mention a debt that my dad incurred that he now owes money to the IRS and money on a judgment against them for a small business that failed a couple years ago. I don't know all the details, but that's the gist of it. So her question is whether or not the bankruptcy will affect what she owes on both the judgment and to the IRS? I guess getting rid of her credit cards will allow her to pay the judgment and IRS off quicker if they aren't affected by bankruptcy, but she was just wondering because she is thinking about trying to file for bankruptcy on her own because she obviously can't afford a lawyer.