The Jersey farmgirl lost out to Luke Anderson, meaning Digital Spy readers' desired evictee has remained in again.
On hearing the news, Lauren quietly expressed her disappointment, while survivor Luke A told Big Brother he was "the happiest guy" yet "upset" for his friend.
However, as Brian Dowling remarked, the ex-contestant was "all smiles" in the interview chair.
The presenter went on to congratulate her on receiving the "best reception" of the series, to which she replied that she was "really happy", having been worried about boos.
When Lauren was asked why she thought Luke A had been saved, she described him as an "amazing guy" and praised "the transition he has made".
She went on to say that she was not surprised at being put up for eviction by housemates, explaining that there was a group of seven people who "find one reason to pick on someone and just all go at it".
She described the house's atmosphere as "horrible", commenting: "Everywhere you look, people are talking and whispering, you walk into a room and people stop. I didn't realise paranoia got so bad in there... it's really hard.
"But then, like, they'd be really nice to you for ten minutes, and then next thing they'd bite your head off."
Dowling described it as the "bitchiest and [most] backstabbing house... for a while", with Lauren responding: "I'm glad you've said that because I thought I was losing my mind."
However, she admitted she was "a bit guilty" of such two-faced behaviour herself, putting it down to boredom.
Discussing Caroline Wharram, she referred to the 20-year-old's "whispering, bitching and gossiping" and remarked that, despite having apologised a number of times for her behaviour, she "just never changed".
Lauren also confirmed that there was no chance of romance with Adam Kelly, saying he was a "great guy" but like a brother.
She concluded by saying that she wanted Adam or Luke A to win, with Caroline as her choice to go.