The news spread widely and rapidly; within minutes, Prime Minister Sheikh Hasina phoned the unlikely survivor and asked about her condition, then flew by helicopter to visit her.
"It's an unprecedented incident," she said afterward, according to BSS.
The news agency said Reshma is from northern Bangladesh's Dinajpur district. She was working as a swing operator for Phantom Garment, which had a factory in the Rana Plaza when it collapsed on April 24.
In addition to the water sprayed over the mound early after the disaster, water may have trickled to the second floor from recent rains, or from fire hoses employed when firefighters extinguished the blaze that erupted during the failed rescue attempt.
The rescue, which came on the same day that officials raised the death toll from the collapse by 30 to 1,043, represented a ray of cheer against an otherwise grim tableau.
The building had held thousands of people, many of them garment workers.
Though rescue workers had pulled more than 2,400 others to safety, 10 days had elapsed since anyone had been found alive.
Since then, efforts have focused on retrieving corpses from the heap of broken concrete over which bulldozers and cranes have been used to speed the cleanup. But Hossain said use of the heavy equipment is limited to areas that recovery experts are certain hold no people.
Many of the bodies have been so decomposed that authorities have struggled to identify them.
"We are near the end," Islam said.
The owners of the building and the factories are under investigation over accusations they ordered workers to enter the building on the day of the collapse despite cracks that appeared in the structure the day before.
The Bangladeshi government has faced criticism for failing to tighten safety standards in the country's thousands of garment factories, where millions of people work.
The Savar building collapsed five months after a fire at a garment factory near Dhaka killed more than 100 people. And on Wednesday, eight people died in a fire at another factory in the area.
The European Union has threatened to take trade action against Bangladesh if it doesn't improve health and safety conditions for workers.
Western retailers and clothing brands that get their products from Bangladeshi factories are also under pressure to subject their supply chains to greater scrutiny.
The smell of death continues to permeate the area, prompting people passing by on a nearby highway to cover their noses. Recovery workers combing through the debris use face masks to block the stench.
Hundreds of people looking for their missing relatives have been waiting by the nearby school where bodies are taken to be identified.
Authorities have sent some of the remains to a Dhaka hospital for DNA testing, BSS reported. Those that remain unidentified are buried.
The industrial disaster here is among the worst ever, ranking behind the 1984 chemical leak in Bhopal, India, which the Indian government said killed more than 15,000 people, many of whom were residents rather than workers.
In his 2008 book "Understanding Global Security," Peter Hough, a senior lecturer in international politics at Middlesex University in Britain, lists just 2,500 deaths in Bhopal, but said Thursday that that number included only fatalities just after the incident.
After Bhopal, he cited 1,549 deaths in a 1942 mining disaster in Hineiko, China; 1,082 deaths in a 1998 oil pipeline fire in Nigeria; and 1,060 in a 1906 mining explosion in Courrieres, France.
Though it is too late for the Bangladesh incident to be included in the soon-to-be-published third edition of his book, the building collapse will doubtless enter history books, he said.
"It's a classic case of a developing country being prepared to cut corners to feed a demand via globalization," he said in a telephone interview. "I'm sure it will be seen alongside other notable disasters. It is already up there in the top five."