Rachel said she was delighted to be one of those chosen to deceive her fellow contestants.
“I really wanted this, and I was manifesting and just visualizing Claudia tapping my shoulder and then when she did, oh my God,” she said during the first episode.
“I can’t wait to ‘murder’ people, I’m so bad.
“I can’t wait and I’m really looking forward to it.”
She told Winkleman that she would use the prize money to take her three children and her mother, who has dementia, on a big trip away.
Rachel is the sister of the former Newry City football manager, Darren Mullen, who expressed shock at her appearance on social media.
“When your sister tells you she is going to England for a course for work and then you see this…” he posted on X.
Rachel’s family hosted a watch party on Thursday as the first episode of the show aired.
On social media, Newry City AFC wished supporter Rachel “the very best of luck” as she takes part in the show.