The Portaferry athlete missed out on selection for London 12 years ago and in Rio in 2016 she failed to reach the final.
"I try to keep it somewhat contained because you could get a little too heightened and carried away with the thoughts of being too far in the future," she said."But don't get me wrong, whenever there's training sessions that I'm finding particularly tough, there's a little bit in my head that says Olympic Games, Olympic Games, Olympic Games.
"I missed almost my entire under-23 career due to injury and then I had a pretty rocky 20s in the sport and I had periods of time where I missed a championship because of injury. "I did. Then I was like 'OK can I do it last year?' I came fourth in the world with a new personal best and a new national record. So now... there's nothing to lose. I'm going out there and I'm trying to improve myself.