I voted twice while living in Virginia, and they never asked for an ID (Arlington). Oddly, while stationed overseas most of my life....they always asked for my ID when going through the base office to request a absentee ballot.
The people’s republic of Arlington is not following Virginia law. You have to show a picture ID.
I don’t think it has to be a drivers license so a school ID should work if it shows her address. If you want to be fully on the up-and-up, they may transfer her registration to her new precinct since she was registered in a Virginia district and is not a new voter.
Contact the registrar in your county and or the new county. If it’s the same county they may not have any issue since it’s just a precinct change.
MY neighbor across the street from me works the polls and he greets me by my name then asks for my ID and makes me say my name and address outloud so the other poll workers and watchers can hear it.