"My stomach wants to throw up, I wanna run away right now," she tells Real Talk, recalling the moment.
"Normally I would have aborted mission quite quickly.
"I wouldn't normally do that in real life, that's the really s***** thing. I would have been like, 'Seeya later, I don't like you, go away'. And it's like, oh god, I'm having to try with someone I'm not getting a good gut feeling with."
Elizabeth says the decision to stay in the experiment was "exceptionally hard".
"In the real world, I would not put up with it," she states.
To hear more about what really happened between Elizabeth and Sam, listen to the latest issue of Real Talk with Holly & Ali below.