My dd had this, this year.
We chose alternative therapy once it was diagnosed.
We used Bowen therapy then osteopath treatment.
Very successful.
We explained to our teachers what the issue was and they worked with my dd.
she would sundown during allegro. Stretch and increase this slowly over a few months.
It was worth it, because now she has strengthened and stretched her calves and the muscles points in her legs.
I read a lot about it and used Lisa howell physio in Sydney Australia to bounce several issues off.