<human>: Can you condense the text into a few key points?

I came out of a five year relationship about six months ago, and I only just feel ready to start seeing somebody again. The problem is, I have no idea as to what I'm doing. I don't feel like I've even experienced dating an adult before. This would have been my first, first date since 2009.

I felt confident that this girl likes me back, other people have even told me that she does. She seems nice, fun, and I find her attractive, so I asked her on Wednesday night (via facebook) if she would like to have dinner with me sometime this weekend. 

Now the weekend is just about over (7pm where I am) and it seems that she's just ignored the message. So:

* Was it tacky to ask a 25 year old to dinner via facebook? I wasn't sure when I would see her next to ask her face-to-face, and I don't have her number.
* Is it possible that she might be playing hard to get/ taking her time to think about it? This is something one of my female friends suggested.
* Do you think that I should say anything else to her, and if so, what and when? 

I feel that she's been very rude to just ignore the message, am I being unfair here? If she had just replied to say that she was flattered, but uninterested in me that way, I would have accepted that just fine. But now I feel that she's just unnecessarily made it awkward.
<bot>: A girl has ignored my message, I'm a noob to dating so I don't know what I do now, and I don't want it to get awkward.