OK, well I am glad it is not rec, with it being preteam the high expectation makes more sense.
I would not throw in the towel yet. As you say, this was the first practice with this coach. Maybe both coach and your daughter need time to learn about the other, and this could take several practices. Also while I do not admire this method of discipline, maybe being sat out will motivate your dd, it's possible. It depends on the kid.
Also it may take you some time to figure out what needs to happen with your dd's overall schedule to make the long practices work for her. More sleep overall and proper nutrition esp in the few hours before practice cures many ills. Sleep and food intake management can be super challenging at this age. Over the summer when my daughter is not in school, we try to avoid strenuous activities (like swimming or playdates) on practice days. Plus in my experience, there is typically a period of adjustment when hours increase.
My family's experience is with 2 boys in MAG (for 9 years so far) and 1 girl in Acro (for 1 year so far.) (So I have seen many different coaching styles and methods but my experience is not with WAG.) I have seen several times, parents pull young kids because they did not like the coach, USUALLY because (according to the kid) the coach was "too mean." These were often the coaches my boys loved. There is no excuse for abusive coaching, but being tough and having high expectation can be the hallmarks of an excellent coach.
There is the issue of age of development and appropriate expectations. Generally speaking, the developmental difference between age 5 and 6/7 is pretty big.
Not all coaches are going to understand this properly, maybe because they are not used to working with that age, or maybe they once coached a 5 year old who conditioned harder than any other kid and then asked for more, and think all 5 year olds should do the same. It is helpful when coaches and parents can discuss expectations and discipline with mutual respect and without fear (on the parent's side) and resentment (on the coach's side) but unfortunately, that is not always possible.