I would tend to ignore the second set and look at the first. I have a female sprinter who is very close to those numbers and she is 56. However, she tends to have better recovery and less speed, and she can use that 200 jog to recover pretty well, so your athlete might go 55; 54 seems a bit quick but within reach. I have written speed reduction curve fitting apps that do extremely well given two or three fly sprints at different distances (e.g. 30 fly and 200 fly). Let me know if you have a recent short and long fly and I’ll try that.
Best,
Christopher