Flick...

This is usually the first display a woman will use when she's around a man she fancies. The head is flicked back to toss the hair over the shoulders or away from the face. Even women with short hair will use this gesture. It's a way for a woman subtly to show that she cares about how she looks to a man.  

Reading female body language has never been easier. For women, twirling or flicking their hair is a favourite flirting gesture.  An explanation is that it is a casual way of exposing her neck – a well known erogenous zone. 

Long, flowing hair has always been a sign of feminine health sexuality and child bearing ability. By Flecking or tossing her hair, a woman is essentially saying: 

“look at me and my suitability. I am happy, confident and very healthy!” 

Conclusion:

You can look as much as you can. She may have been flecking someone else.  Just a thought.