Right now, I would not keep sending emails to those schools which have told her that they are finished recruiting for her position.
What I suggest is for your daughter to expand her view and reach out to new schools with introductory letters/email and video. In addition, she should keep in contact with those schools which have not informed her of their finished status with recruiting. My father once said you can never have too much money, and along with that logic, you can never contact too many schools!
But, during the Holidays, I would take a moment and send a brief email out to those schools which had previously told her they were done, to let them know she is still interested should an opportunity come available. Often, and this is becoming too often in my view, scholarships and opportunities become available upon the completion of the College Volleyball season. With the multitudes of good, solid PSA's in the Club and International Volleyball recruiting realm, it can happen that a college coach does not have a previously 'cut' recruit in the front of their minds, and they might be happily surprised to find her still available.
Sometimes the recruiting pin ball does not bounce your way initially. It can be tough being #2 on the recruiting depth chart, but you have to stay focused on reaching out to potential schools and going through the process. There is still a bunch of time left and come next winter/early spring, many more DI opportunities will be there.