1600m strategy

That sounds like a very stupid plan. Can she even run a 70 flat out? And then how is she going to be able to run faster than her PR pace after a suicidal first lap? 80s is 5:20 and 85s is 5:40. Her PR is 5:53. I could see her maybe going out and trying to run as consistent as possible right at her limit to burn the kick out of the competition, but running stupid the first lap isn't the answer.

Honestly though I would be very surprised if a 15 year old girl with a 5:53 PR and "no kick" can even run a 70 for a single all out 400.

Her fastest time possible depends on what strategy was used to run the 5:53. Assuming it was by the time her coach had told her to go out in a 70 and assuming she did so, then she could get down to 5:40ish, possibly even under.

She should go out probably in the low 80's (80-82) then really focus on the second to not let it fall off too much on about an 85-87, grind out the third in hopefully the same as the second, and see what you have left on the last lap in the back stretch.

This could get her anywhere from 5:30-5:45 mainly depending on how much strength she has, but more importantly, how large her balls are, and how much pain they can deal with.

Thanks for the insight. I was thinkging much along the same lines. I am currently deployed, I nearly dropped the phone when she told me that was her coaches suggestion.