She could probably do something more than loosening a wire that he couldn't fix without being able to drive--like taking the battery home with her.
Power of attorney allows you to act on behalf of a person. It wouldn't allow you to withhold a person's own property from them, I think. You'd need a conservatorship or something like that to do that, I think. (Note--not my area of expertise, not legal advice, she should consult a lawyer).
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