Harry and Wilma were divorced in 2008, and Harry was ordered in the divorce decree to pay his ex-wife$10,000. In 2009 and 2010 Harry was hospitalized, incurring $3,000 in bills. He and Wilma discussed the matter, and Wilma agreed to pay the bill with her own money, even though Harry still owed her $5,000 from the divorce decree. When Harry died in late 2010, Wilma made a claim against his estate for $8,000(the $3,000 in medical bills and the $5,000 from the decree), but the estate was only willing to pay the$5,000 from the decree, claiming she had paid the hospital bill voluntarily and had no contract for repayment.

Is the estate correct? Explain.