Insurance To Get A 18-Year outdated (super-car)?

“16yr old girl in Ohio”Im 17 and im about to get a vehicle from the pal but i wanted to understand if my mother may merely include her insurance and the automobile say something. Then it can be driven by me and also the car it’s still insured right? Thats im doing right now anyway. I’ve my permit driving my momis vehicle to apply in”Whats the least expensive way while still getting good coverage in case there is incidents to cover a car