I think that was a missed opportunity. I would have said this:
"Deer are wild animals, Mame. They cannot be controlled to cross at specific locations such as School Crossing where little children would delight in seeing them. The signs are there to inform drivers like yourself that is the location where these wild animals cross the road without warning or supervision. Do you understand you have to be aware of the danger these wild animals present and drive more slowly so you can stop if you see one crossing the road. Deer tend to be impulsive wild animals so you have to drive very cautiously when you see the Deer Crossing signs. Any questions about your responsibility in regard to these wild animals, because if you hit them they could be killed and there is a traffic infraction if you don't take responsibility in stopping to report the impact. There is also a real possibility, on a rare occasion a person could be killed at these Deer Crossings by impulsive wildlife. So. Do you have more questions?"
The State Wildlife Department needs to run public service messages and/or retest people to prevent low IQ folks from driving."
Now, losing her driver's license doesn't mean she cannot vote. It would prohibit her if she was unable to drive to the licensing bureau to get a picture ID, though.