I think sometimes actions speak louder than words. This girl says to you: "I'm around anytime" but then when you text her, she ignores you and does not meet up with you. I would say that her actions are telling you she is not interested.

As a woman who is in your age bracket, I can also tell you that the way you talk to her would be considered a "turn off" by most of the women I know. You seem to be very passive aggressive. For instance, when she ignored your text, you responded by saying: "ok, I guess I'll just leave you alone then." That's a pretty immature way to respond. You also refuse to ask her on a date, but you "remind her of the big crush you had on her." That's also immature and passive aggressive. I don't know where you are located, but I live in the suburban US and, unless you ask a girl on a date, you are unlikely to ever "date" her. Formal dates are still very much a thing. The "hang out" was popular in high school, but not now that we are all adults. Unless you put some effort into courting a woman and prioritize her needs/wants, she is unlikely to consider you a potential suitor. The way you come across, at least on this forum, is insecure and shy and afraid to make a move. Most women want someone who is confident and will actually make an effort.