Her probation officer has accused her of violating the terms of probation. When that happens, the court can issue a summons or a warrant. If they issue a summons and she doesn't appear at the appointed time, they'll issue a warrant.
In general, she'll be brought to court immediately. Her PO may ask for her to be detained, or may simply ask for a final Violation of Probation hearing date. She will likely be appointed an attorney, particularly if there is a detention request.
A final violation of probation hearing will be scheduled. If she's detained, that will happen within 30 days. If she's not detained, it will be scheduled "in due course" - usually 45 to 90 days.
At the final hearing, the judge will hear evidence and determine if there is a preponderance of evidence showing that she violated the terms of her probation. If she is found in violation, the judge can sentence her up to the maximum (two and a half years for A&B), can reprobate her under the same terms and conditions, can reprobate her under new terms and conditions, or can terminate her probation and discharge her.
Since they arrested her last night, she should be brought to court today. In fact, she's probably already been brought there by now.
BTW, if the judge detained her but scheduled a short date for the next appearance (like later this week), that's a good indication that the judge wanted to scare her with a few days in jail and will release her at the next appearance.