Ratcliffe was understandably pleased with her performance and said: "It feels so good to get the Olympic qualification mark off the plate and I can finally focus on building up for Tokyo.
"It was just awesome. It was like the culmination of 16 years of training with Dave (coach and father) in the crowd. In the last week or so training has been up and down, so to keep it all together was the big challenge. It was more than I could have hoped."
Two months ago in her last outing in Hastings, Ratcliffe committed three no throws so for the 27-year-old thrower to launch such a long throw in round one was a surprise given her cautious strategy.
"Because of how it went last time (in Hastings), I went in with the attitude that the first throw was my safety throw, so I focused on just getting it between the little white lines. That was my relaxed one, obviously relaxed worked for me!
"I was still in shock a bit after the first throw, but it was, yes, just keep on doing what you are doing."