From what I can see the 160 set didn’t tell you much. I don’t think training times are a good indicator for race times personally even in testing.
I’ve put the 26.6 200m time into Brian Mac’s sprtin predictor calculator and this predicts a 60.85 for the 400m. I have used this predictor a few times and it is pretty good. Obviously it is dependent on the right training but it shouldn’t be far out and good enough to give her a kick. She’s obviously got sufficient speed.