The virgin persona was something she created for one of her jobs working as a webcam girl. That virgin persona was specific to that job.
She has decided to go into Big Brother using that same "virgin" persona.
Danielle has not only had one job. She has had several other jobs. Sex chat line worker for Bluebird TV is one (her persona for that is "Imogen"). Zoo, Nuts model etc are others.
Here is another, this is webcam work, but obviously not the "virgin" persona.
The character she is playing in the house is not Danielle the REAL person, it is the "virgin" persona that she used for one of her jobs in real world.