“Don’t worry; moving violations follow the driver, not the car. So you are in the clear!
When the officer pulls someone over for speeding, they check the driver’s license and run their driving report in their system. A ticket is associated with a license number, not with any of your vehicle information.
Your cousin will likely see her car insurance rates increase. Speeding tickets go on the driving record, and come time for policy renewal, her insurance company will likely pull her driving report to help them recalculate her rates. It’s standard practice, but it won’t help your cousin.