“I didn’t know he was a felon”. “I didn’t know he was armed”.
Can they prove otherwise?
Probably not, "beyond reasonable doubt".
Prosecutors don't like to take risks on weak cases. Most likely, no further legal action will be taken against the driver, unless she does something really stupid to antagonize the district attorney.
She is going to need hearing aids. Maybe she can sue the county and get settlement money to buy a set.