All women naturally love their hair admired, but for some reason the touch boundary is hard to break. When it is another woman we feel complimented and not threatened. Touching each others curls or braids, is simply--Wow, how did you do that? I love it feeling. I believe that any woman whose hair "needed" to be touched, aka, it is obvious is very interested that her hair is her shining glory, if approached with calm and respect would love to have her hair touched. Maybe with the compliment "I would love to see how your hair looks in other manners, such as around your shoulders, or up, etc., may lead to the opportunity and to reflect your charm. Perhaps approaching her with the aspect of her total beauty enhanced with her hair will open the opportunity to make her feel more at ease, enhancing the conversation and of course also the possibility of touching her hair.