You don't actually enter the 1099-S anywhere in TurboTax, just the info from it, if required.
Since the deceased owner's spouse lived in the home for more than two of the last five years prior to sale, it would be considered as the sale of her main home, even if the mortgage company didn't put it in her name. By default, after her husband's death, she inherits the home, as a legal spouse.
This falls under the Home Sale Exclusion, so unless she made over 250K on the sale, she wouldn't even need to report it in TurboTax.
Save the 1099-S with her tax records.
@ingra003
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