Either way, nothing wrong with flirting. She's obviously flirting with other dudes.
Besides, you can't base everything you do on one person. Then it becomes obsession.
Being brazen about the flirting may or may not work. If she has some issues with depression,
and you're the guy she talks to when she's bummed out, it may have some adverse effects to what you were looking to achieve.
Who knows though. Girls are a strange bird.