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Originally posted by Optimist Prime well, the next move was asked her to dinner for tonight. Oh well. She's busy but said thank you and smiled. She still isn't clear about her schedule on banquent day 
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My gut says she is keeping your invite in mind to see what other offers she gets. I find that demeaning and if were me I would tell her to forget it if in anyway I expected she were playing me. A less dramatic course would be to tell her you need to know by a specific time (and dont make that far from now).
However, since I'm not close to the situation only you can judge her motives and there is a good chance you may not be able to do that.