If she has a conviction, it is not possible to seal it. She has to ask for a pardon from the state. See HERE. This is at the Governor's discretion.
The pardon, if granted, would not erase the conviction. However, it would state that it was forgiven, and would lessen the "stigma" associated with it when applying for jobs, for example. It also allows for restoration of voting and firearm rights, for example.
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