Police said the readymade garment worker, who was just 27, hanged herself on Friday morning.
Her body was recovered around 11am from her home in the Bamnar Tek area, at Turag, in Dhaka.
She has been living there with her husband 'Babu' for the last two months.
Turag Police Station Sub-Inspector (SI) Kamal Hossain said, "Babu said that Salma had been injured on the head in the Rana Plaza collapse. Of late, she had been suffering from severe headache. The neighbours, too, said the same thing."
"Babu believes Salma hung herself because she could not suffer the pain any more," he said.
SI Hossain said Salma's body had been sent to the Dhaka Medical College and Hospital for autopsy.
Police, however, were investigating the incident, he said.
Babu said he is an assistant to a vehicle driver. Salma worked in a readymade garment factory on the sixth floor of Rana Plaza.
She was found alive several days after the multi-storied building collapsed on Apr 24. She was in hospital for sometime due to critical injuries to her head and other parts of her body.
Babu said they had left Savar and started living at Bamnar Tek area two months ago.
He said Salma used to bang her head on the wall when the headache became unbearable.
He said they had received Tk 60,000 as aid from the government until now.
The Apr 24 tragedy at Savar, on the outskirts of capital Dhaka, had killed over 1,100 people, mostly readymade garment workers, while rescuers managed to pull out over 2,000 others alive.