The former porn star made her feelings about Janice clear in her exit interview with Emma Willis on Tuesday evening (22 September), after she became the sixth celebrity to be voted out of the house.
When asked about her Team USA housemate Janice, Jenna replied: "I think everybody is bearing witness to the craziness. I get whiplash. She will wake up in the morning and be super kind, overly, weirdly kind, then slowly but surely she converts into this raving lunatic and it really throws me.
"Usually I can get a beat on people and figure them out. But I think she is completely gone. She should be committed. It's scary."
Janice was the seventh person to be evicted, leaving the house just after Jenna during the double eviction. In her exit interview, she praised her housemates for helping make this the "most valuable experience" of her life, even if there had been clashes and disagreements along the way.
CBB airs nightly on Channel 5.