That sucks, but it is unfortunately very common. I always tried to approach it as my kid could tear her ACL in week one or be benched as a sophomore when new freshmen arrive, etc., so I tried hard to help her pick a school where she could be happy even without her sport. Easier said than done and my kid walked away from her D3 offer in part because of that.
When we were in the midst of the recruiting process, however, I noticed that students were transferring on to some of the teams my kid was considering. I think your daughter should prepare herself for the fall as best she can, but maybe also start identifying a list of transfer options she can pursue if she arrives on campus and doesn’t like the direction things are going. I hope she ends up loving the new coach and has a great first year, so no Plan B is necessary, but sometimes it helps with anxiety just to have a Plan B in mind.