After finishing second in the tenth series of the show, Nolan told journalists including Digital Spy that Welch contacted her before she entered the house and tried to change her mind.
"I got one text the day before I went in and it just said 'Don't do it, it ruined my life'," she said.
"Maybe it wasn't great for Denise to do but I think I was in a better place than she was at the time.
"I went in there happy in my own life and everything was good, and I still [struggled] with my emotions. So to go in there with any kind of troubles and unhappiness - which I think Denise did, obviously tenfold - it must have been so much worse than it was for me."
Nolan, 47, revealed that curiosity led her to sign up for the show, and said that she has "no regrets" about her decision. When asked if she would consider entering the house in the future, she admitted that she wouldn't be able to face "[being fed] little bits of a paranoia" and the "mental torture".
"[I did it] for my kids and money… and the experiment of it," she said. "[It was] fascinating to be part of, but if they offered me the world I wouldn't do it again."