WOW! This girl is totally justified in quitting. In a normal situation the kids should of course give the new coach(es) a chance and go with the new program. But when the alleged distance coach mandates that no kid on the team run over EIGHT miles a week -- EIGHT MILES -- and makes kids sign a contract stating among other things that they won't go and do (more intelligent) training on their own outside of practice, that is far a normal situation.
The new distance coach obviously has no clue what he/she is doing, and the stud athlete clearly has a good grasp on training (although 80+ mpw is a tad excessive for a high school girl IMO). If she were to do as the new coach asks and drop her mileage from 80 in the winter to EIGHT during the season, her performances would likely drop off a cliff and it would be an extremely frustrating situation for the poor kid. She did the right thing and I hope a college coach somewhere sees the situation and offers the scholarship she obviously has earned.