One thing, is hair usually grows at the same rate. You would not have as many extraneous strands of hair unless she had a vitamin deficiency or the hair is cut that way. If its cut that way, then at least ten or twelve hairs will acompany it. Hairs also usually conform to the hairs next to them to some degree as elongated pliable cylinders are want to do when under the effects of gravity. Again, there are exceptions in the case of vitamin deficiency or curl or kink but even then, the hair would closely conform to the hairs next to it. Try thinking of hair as a thick congrous unit first then add the texture map keeping in mind that the hair should be nearly (but not quite) the same attitude as the hair next to it and should be roughly the same length unless cut differently for a reason. I suggest getting a fashion magazine and clipping pictures of the hair you like and want to copy. Nothing beats photo reference right there in front of you when you are trying to pull off an effect. Memory is imperfect and having the photo in front of you helps immeasurably. Hope this helps.