This isn't the first time the pair have clashed.
In a lengthy rant Jess says the law graduate was "gas-lighting" Hayley.
"What I see here is a girl who's 25, gone on this show and just gaslighted the s*** out of [Hayley] who has actually worked her entire ass off to be fit, healthy and brought herself out of the darkest of places," Jessika wrote on her Instagram story alongside two photos of Stacey.
She continued: "All to be labelled and slandered by someone who is clearly insecure that someone may bag more 'air time' than her. [Stacey] even wrote to me that she thought she was the new 'me' on the show."
Jess later shared a series of screenshots from Hayley and Stacey's co-stars, with three unnamed contestants concurring they weren't a fan of Stacey.