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Playing with hair as IOI must be with present other symbols as well. Playing with hair can also mean that girl feels uncomfortable or shy. If there is just you and her and if she plays with her hair, touches or bites lips, etc can be IOI u can easily check if she is comfortable with u with some not too sexual kino. Like sit by her and place your hand that your hand or for example knees r in contact if she doesnt move for a longer time she most likely likes u.
Agreed. The thing with Indicators of Interest (IOI) is you need to spot a few. Girls playing with their hair is so random. I know girls that do it without even thinking about it, they just sit and twirl their hair. Some do it as nervous energy, some out of a habit developed, and some as part of an IOI. There are all kinds of IOIs to look for but eye contact in set is huge, laughing at your jokes, touching you (kino) obviously, them orienting their legs or hips toward you (being hooked), or them asking for your name are generally the better ones. There are tons of secondary IOIs like this but I generally don't pay them as much attention.