Thongdee Jamsri, 73, accepted the ruling but said she planned to ask for a royal pardon.
Her daughter cried upon hearing the verdict, saying the convict has many chronic diseases.
The case against Thongdee started in 2011. Last year, the lower court sentenced her to three years and four months in jail. She appealed.
The Court of Appeals, however, yesterday upheld the guilty verdict and jail term, though with a reduced imprisonment period. The woman was denied a suspended jail term because she had earlier been prosecuted for possessing kratom.