Nicoll said it is “surreal” to be in the team after her previous experience as a reserve in 2022.
“It hasn’t sunk in yet,” she told BBC Sport.
“Being in Beijing in 2022 and being the alternate, it was a scary position to be in because there was no guarantee I was ever going to earn that Olympian title.
“There was a little part of me that always believed it was going to happen and here we are, four years of absolute graft and I’m really proud I got through that time.”
Nicoll suffered a serious injury at the start of her season. Her spikes got caught in the ground during a training session, causing her knee to hyper-extend.
She has since however hit the best form of her career in the bobsleigh.
“Starting the season off with injury is never how anyone wants to start off their Olympic campaign but I’m really proud of how we pulled through that.
“It was a case of not sitting back and adopting a victim mentality, it was ‘right, this is the situation, how do we move on and get better?’
“The Olympic deadline wasn’t going to wait for anyone. It’s been such a battle and we’ve been fighting our hearts out every single week.
“We managed to finish with four podiums out of four at the Europa Cup, putting us into a really strong position heading into the games.”