My guess is that she can still vote in her previous home precinct. That is where she is registered.
That is what I would do.
Does she have to show a photo ID to vote?
Even though her previous drivers license shows canceled, it should be still OK for ID, she doesn’t need a valid DL for identification, only if the police stops her.
Good luck.
#5. She should bring her old driver’s license, new one with new address, and Marriage Certificate to the voter registration office ASAP. They might be able to assign her a new voting precinct card before the elections.