It said the exchanges started in 2020 when the teenager was aged 17.
The corporation launched an investigation headed by a cybercrime expert, but the presenter remained on air.
I blame this BBC man for destroying my childs life, she was quoted as saying.

BBC headquarters in LondonGetty Images
She said the presenter did little to conceal his identity and requested performances.
Bank records show the teenager was paid a lump sum of 5,000 on one occasion.
The mother added: There were huge sums, hundreds, or thousands of pounds at a time …

The money had been in exchange for sexually explicit photographs of my child.