Authorities say she buried her mother in her backyard, then cashed in the woman's social security checks.
66-year-old Patricia Hodges was sentenced in federal court to 30 days in prison.
She was also sentenced to home confinement and ordered to repay more than $141,000.
Hodges had pleaded guilty to theft of government money for cashing Janet Kelly's checks for 14 years.
Social Security officials say Hodges told them in 2011 that her mother was on a cruise.
Authorities found that Kelly had died in 1997 and Hodges buried her in the backyard of the Florida home where they had lived.
Prosecutors say Hodges admitted concealing the death to collect benefits.