The Mom sounds level headed, but her being a single Mom of four, with a 7 year old who is having behavior problems, may be overwhelming. I hope she gets the help she and her son will be needing. She says so far, she doesn’t get any state help because the boy is only 7. We all now see what this 7 yr old is capable of doing.
A 7-year-old, with decent training, is quite capable of operating a properly sized car. (or a mini-motorcycle).

Behavioral problems? He's bored.
Society needs to stop treating boys as though they were defective girls. This kid needs to be in a motorcross league, maybe in a hunting club too.
His ancestors rode and drove horses at that age.
How did she not know her 7 and 5 year old were missing, and her car?