The You Are What You Eat host has so far struggled during her stay on the jungle reality show, most notably when she fainted as she took part in a bushtucker trial.
However, programme bosses have questioned whether McKeith's collapse was authentic after it appeared that she pulled down her T-shirt to cover her midriff while supposedly unconscious, reports The Sun.
"There's something not quite right," a source said. "She is constantly screeching about bugs but has been sleeping soundly in her jungle bed.
"She claimed she knew nothing about the show and thought she could stay in a hotel. Anyone in their right mind would have made sure they knew what the deal was before they signed up. There's something fishy here."
McKeith has also apparently started to tell campmates that she can hear voices in her head - one voice telling her that she is doing well, and another voice urging her to quit.
The source added: "Whether she's making this up too, who knows?"
Show hosts Ant & Dec and Get Me Out Of Here Now co-presenter Joe Swash have all suggested that McKeith's dramatic reactions may not be entirely genuine.
> Britt Ekland blasts negative McKeith