Re: Hair flipping really an IOI?
I usually interpret twisting or playing of the hair to be more of an IOI than flipping it.
Nonetheless you only caught one IOI according to your post. To know for sure you need at least 3 distinct IOI's from her to make an educated guess that she is interested and can move on to the next step. This comes with practice and NEVER EVER come to a conclusion about a woman's feelings about you based only on one thing you noticed. She may just as well have shown a lot more disinterest in her body language, but you may have missed all those signs and only noticed the one IOI.
"All things are subject to interpretation. Whichever interpretation prevails at a given time is a function of power and not truth."