Both of the possibilities your friends mentioned could be true, which is why she’s really hard to read.
She may still have feelings for you and that’s why she can’t completely let go of you. But it’s also possible that she’s just keeping you around without any real intention of getting back together.
Since she still hasn’t taken the initiative to reconcile, maybe you should be the one to bring it up. That way, you’ll have a clearer idea of which of the two is actually your ex’s intention.