safely find a way to stop any bleeding and to also check if there is any broken bones if there is any detected then find a safe way to put her on the ems stretcher when they arrive so the ems team can then get her to an doctor.
Assuming acceleration is maximal, the majority of athletes will have reached their top speed (maximum velocity) after 7 seconds. Young athletes may reach their maximum speed between 15-30m of a 100m race whilst for senior athletes this may be between 30-60m.
One of the major benefits is the fitness and health gain that comes along with it. The more you practice and work in it, the stronger your body gets.
I hope this helps! :)