Hi ud19.
I don’t mean to be overly simplistic when I say that maybe you shouldn’t talk to her about race strategy. She probably needs to just relax and run as fast as she can. It will take a few races without a strategy to ‘feel’ it but that would be my starting point. How old is she? I have a similar problem with a 14yo 300m runner who over thinks things. She has a 61.5 400m time and my strategy is to spend time taking her mind off the race.