Keep that constantly chilly person warm without having to overheat the car

I used to be the cold one, but now my daughter is the family member who feels like she lives in an ice box.  She always wants the heat turned up or the air conditioner turned off in the car, while her dad and I are sweltering.  I need to get her the Trillium Worldwide Car Cozy 2 12-Volt Heated Travel Blanket.  It plugs into the car’s 12V power supply and heats up to warm up that one trouble maker person who needs some extra warmth.  The blanket is 58″ X 42″, so it’s big enough for sharing.  It’s made of 100% soft, high-quality fleece, and it has a 30 or 45 minute timer with automatic shutoff.  The Trillium Worldwide Car Cozy 2 12-Volt Heated Travel Blanket is available from Amazon in navy ($27) or red plaid ($40).