What happens when there is a Probation Violation?

My daughter is currently on probation, this is a dui misdermeanor charge, in Oakland County Michigan. The judge gave her 7 days in jail and put her on Probation, plus 30 hours of community service and attend a MADD cl, and random Alcohol/Drug test. This was in October. She completed her community service and MADD cl in the time frame that was ordered. Now she is still doing the testing. She has never missed a test, she calls everyday at 12 Noon to see if they call her color. I make sure she goes, since she has a suspended license. Now she is paying the fines that were ordered everytime she goes to see her Probation officer. But when she went yesterday to the probation officer they told her that she missed her Jan 9th test. She said she couldn't have I agree I ask her every single day that she calls and sometimes I am sitting right there with her just so I can hear if they call her color so that we both heard it and make sure I gets there. Well we are both scared because we are almost sure we went. She has never missed a call. We went back and checked the cell phone records and she did call that day before which was a Sat. Jan 8th and then she would have had to go Sunday morning Jan 9th. And it shows she called at 12:28pm and then she called on Sunday same time as always. If we would have heard that color we would have went. Now she is going to check with the JAMS place because she has to sign in when she goes and see if they have her signature. If they do not what can we expect. This is Oakland County. Do you think the judge will take probation away or give her another chance or even lengthen the probation because she has already completed everything else that was required under her probation.....