Karina Saifer Oliveira, 15, allegedly killed herself after she heard rumours that the photos had been shared throughout her home town.
The gossip had spread through her school and the bullied girl was said to be living a "personal hell".
Her devastated mum Angela Saifer said there were no outward signs that the teen was in distress or planned to commit suicide.
Ms Saifer told BuzzFeed News that her last contact with her daughter was a WhatsApp message just hours before she found her dead earlier this month.
The high school student, from Nova Andradina, Brazil, had asked her if she could leave class early.
After she took her own life on November 7, photos were taken of her body and sent around on WhatsApp.
Her father Aparecido Oliveira, 47, a security officer at her school, said Karina had mentioned the rumours to him two months ago.
It was claimed that intimate photos were taken of her by a 17-year-old boy she dated when she was 14 and then posted online "like a trophy".
via Sandra Spicy
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