Getting the gist of the story, she said: 'All I'm saying is, I'm telling you now, if there had been violence in here then they would have come in and taken him out.
Since leaving the house Pallett has deleted her Twitter account.
A Celebrity Big Brother spokesman told the BBC: "Roxanne has made a decision to leave the Big Brother house".
She told the Diary Room: "I went from being upset to being angry, because a boy has punched me repeatedly, unprovoked".
This followed an incident which caused huge uproar, as Ofcom, the British broadcasting regulatory body, received over 11,000 complaints about the episode which aired on Friday 30 August.
After Ryan confided in housemates Dan Osborne, Ben Jardine and Jermaine Pennant he never meant to harm Roxanne and the situation had been skewed, Roxanne rushed to tell the boys her side of the story.
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The actress can be seen breaking down in tears as she sits in the Diary Room alone.
Ryan was given a warning after the incident with Roxanne, but she was blasted by celebrities and the public, who insisted that Ryan did not hurt her.
Her exit from CBB was announced this morning, with a spokesman for the show saying: Roxanne has chose to leave the BB House.
"I'm going home. I need out".
She continued: 'I don't disbelieve Roxy but I don't know, I don't think she's lying about it but I don't know if he's been like that.
But things got a little too much for the pair's Celebrity Big Brother housemates, as they found themselves turning on the Emmerdale actress, 35.
Roxanne asked Big Brother to remove the Corrie star after accusing him of punching her "like a boxer would punch a bag" in the midst of what was seemingly a play fight. "I promise you've got it wrong".