Are you sure you are looking at the real ballot? Frankly, I doubt it. My guess is you probably received a sample ballot from some radical group telling your mother how to vote. It looks like a ballot, but isn’t the real thing.
I doubt that any voter registrar in the country would be sending out pre-filled ballots. That would send people to jail. We aren’t that far gone yet. YET.
She gets radical democratic propaganda in the mail all the time.