The deferred sentence has been a bone of contention among criminal defense lawyers in Washington State for a while now. The problem is that during the period between the date of the guilty plea and the date she becomes eligible to have her plea vacated and the charge dismissed, state and federal criminal records will carry the charge on her record as a conviction.
Often times, this conviction data will end up in the files of commercial criminal data companies, the State Patrol, the FBI or other federal agencies. But when the plea is officially vacated, the vacation data is not sent to those agencies, so the data showing the conviction is never removed. This can mean that even after the deferred sentence is fulfilled by the court and the guilty finding is technically vacated, her record may still show the conviction.
The only way I can recommend remedying this is to undertake a separate criminal vacation action once the deferred sentence is granted by the court. A criminal vacation is typically done three to ten years after someone is convicted to a crime, and it actually allows people to get full-fledged criminal convictions off of their record if they can show proof of rehabilitation. People will typically use vacations in situations where their sentences have not been deferred, but because a criminal vacation is a court order that requires the state records to be cleansed of criminal conviction data, vacation actions can their uses in purging deferred sentences as well.
On the judgment and sentence the Court either entered a "deferred" or a "suspended" sentence. If the deferred sentence is marked, then the matter should be dismissed at the end of the jurisdictional period (assuming all conditions of the deferred sentence are successfully completed). If the suspended sentence is marked, the the matter will remain on her record unless expunged at a later date. Note also that a deferred sentence will only be dismissed for purposes of the Court's information; if it is a driving offence, DOL's records will maintain the finding of guilty even after the matter is dismissed by the Court.
Hope this helps.