Softball Base Runner

[rbrown]

My daughter is a softball player - 3rd string varsity pitcher.
Since she rarerly plays what are the softball rules for base runners?
Most of the time she sits on the bench; however, she is a very fast runner and and an excellent slider. Her running time down to 1st base is usually between 2.6 to 3.0 seconds. Can she be a base runner for any player without being put into the batting line up? What High School rules apply to courtesy runners and substitution runners?

Thank you