Will the completion of a diversion program require someone to disclose the offense on an application or will their record be expunged?

As long as your daughter's has not been in trouble with the law before, this is exactly the type of case that pre-trial diversion was created for.  It is a program designed to give certain first-time offenders a second chance to avoid being marked by a criminal conviction.

While the details of these programs vary somewhat from jurisdiction to jurisdiction, the basics are usually the same. An individual who is charged with a first criminal offense (typically minor nature) and who appears to be an individual not likely to be a repeat offender, may be given the option of diversion. If the person accepts the offer, then they will enter a plea of guilty to the offense but the judge will not enter an order for same at that time (a person is not guilty until a judge issues a finding of guilt and enters a conviction).

Instead the judge withholds adjudication for a certain period and places the defendant under certain restrictions similar to being on probation. If the individual successfully complies with the terms and of their pretrial diversion, then at the end of the time period the charges are dismissed and the person is not convicted of the crime.

However, if the defendant violates the terms of their diversion agreement, then they will be brought back to court for a sentencing hearing. Since the person already entered a guilty plea to the charge, they no longer have the right to go to trial on the case. Therefore, if the judge determines that the defendant failed to complete the program, then the defendant will be convicted and sentenced for the crime.