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Report the transaction as the sale of a second home.  

The cost basis for the home would be the fair market value as of the date of her father's passing, plus any improvements you made to the property while waiting for probate to clear.

(If the executor chose an alternative valuation date, per 26 U.S. Code § 2032 - Alternate valuation, the cost basis would be determined using the FMV as of the date 6 months after the decedent’s death).

Report the sale of a second home in the Stocks, Mutual Funds, Bonds and Other interview of Investment Income.  When the program asks if you received a Form 1099-B, select "No". Completing the interview will generate Form 8949 and Schedule D. 

See Where do I enter the sale of a second home, an inherited home, or land on my 2019 taxes? for instructions on how to access this interview in either online or desktop versions of the program.  

For the online program, here is a sample of the opening interview screen for "sale of second home ":