If she were someone else that spent the last 50 years speaking against America and has not been convicted of a felony while over seas they can still vote. A vote is right that can only being taking away for crimes when someone is convicted.
The right to vote should guarded at all cost. This is why it is so important to stop voter fraud. Voting is at the core of democracy.
I lost my right to vote in UK elections after living abroad for fifteen years.