There is no doubt that healthy hair tend to grow faster. She should avoid using hair straighteners as heat will make them weaker and she will need to cut off her endings more often which I am sure she wouldn't like at all. She can also try products for damage hair. Olive oil is also perfect,. You have to heat the oil so that it is warm, not hot, and then apply it to dry hair, avoiding the roots, put a towel around the hair to keep the oil warm and live it there for about 1-2 hours, and then rinse well. These will make your hair much healthier.