If my daughter’s attorney went on a vacation without securing her next court date, is it constitutional for them to hold her with no known court date?

My daughter turned herself in on November 29, 2016 on a probation violation and she had her final pretrial on Jan.6, 2017 after which her attorney (public defender) went on vacation without informing her of what happened at her pretrial and without securing her next court date. When I called the court the following week I was informed to call back in a few weeks and they may then have her next court date. Is it constitutional for them to continue to hold her with no known court date? I know for a fact were we financially able to post her bond and she had been able to be present for her pretrial, they would have made sure they gave her a court date to return.