Hair Regrowth

So my sister had accidentally lost all the places on the head hair. It was like 3 random bald spots, and her hair is growing in general, barely. She smokes and is overweight, but trying to get healthy. Is there a way to make the hair regrow in bald areas, and their hair? Minoxidil. Proven to regrow hair. We can know that Rogaine. [I think that's how you spell] biotin.Biotin multivitamins and healthy hair, skin and nails take. I take every day. You can buy them at any pharmacy.