How old are these girls?
For a 60-second runner, I think the workout is pretty hard. But, if she is truly a 400 runner, she should be well under 60 with a 26.3 200.
Almost all teenage sprinters are complainers!
i hope the date can help you to analyze the problem:
sprinter 1 16yrs old 100m 12.4sec/ 200m 25.8sec/ 400m 60sec
sprinter 2 17yrs old 100m 12.0s/ 200m 25.2sec/ 400m 60sec
sprinter 3 18yrs old 100m 12.8s/ 200m 26.4sec/ 400m 62sec
sprinter 4 18yrs old 100m 12.3s/ 200m 26.3sec/ 400m 62sec
the 16 and 17yr old girl are both 9months in the team
the 18yr old girls are both 20months in the team