Sakhina, 21, died of her injuries at Dhaka Medical College Hospital (DMCH) on Wednesday morning, Dr Partho Sangkar Paul said.
She had suffered 30% burn in the November 22 fire at Colour Match BD Limited.
The death toll from the accident has now risen to four.
Twenty-six workers had sustained burns in the accident – seven of them were critical.
Of them, 20 were admitted to DMCH – most of them between the ages of 14 and 16 – while the rest were taken to Savar's Enam Medical College Hospital.