Sophie Dorbeaux meanwhile told AFP she had left the block on Sunday night to stay with her parents because her door, like several others, was not opening or closing properly because of the building's structural problems.
The discovery of a fifth victim at dawn on Wednesday came as angry local people accused Marseille officials of leaving the city's poorer residents living in risky housing.
The building had been the subject of an appraisal and work in October.
120 police officers and 80 firefighters during the night clearing the debris.
The two buildings, one apparently vacant and the other housing apartments, collapsed on Monday at 9am local time (9pm NZT).
Authorities said they were looking into what caused the collapse of the buildings, described by residents of the area as dilapidated and in need of fix.
Google Maps images taken in recent months showed the two collapsed buildings had large visible cracks in their facades.
"We still have hope, even if that hope is fading". "It is the houses of poor people that collapse - and that is no coincidence", he was quoted as saying by local media.
But a 2015 government report said about 100,000 Marseille residents were living in housing that was unsafe to their health or security. The disaster, he added, was "100 percent the fault of city hall".
Marseille prosecutor Xavier Tabareux said the body of a woman was recovered after three other people - two men and a woman - were found dead in the rubble earlier. He said it was believed that eight people - five residents and three visitors - were in number 65 when it collapsed.
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