I'm sorry for your loss. Was this credit card debt forgiven by the credit card companies? Did your receive a 1099-C for cancellation of this debt for 2017?
If not, then you don't have any income to report on her final tax return.
Even if you did, if she had no assets, she could be considered insolvent at the time of the debt cancellation, and would not have taxable income. That would be a more complicated situation, and you would need to use Form 982 to show insolvency. Any TurboTax CD/Download Product could handle this. You would need to make your entries in Forms Mode.
See this link for a discussion of Cancellation of Debt.
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