I think you should ask her on a date. If a person has an initial attraction in you, then they would typically for sure go on a date with you. It's been a while so I say just call her and ask her on a date.
The way I see things is that if a woman does give signs of interest and are TRULY into you, then they WILL accept a simple date. Think of it this way. If you were interested and attracted to a woman, aside from DJ theories, would you reject her if she asked you on a date? I doubt it. Whether 5 minutes or 5 hours, if you are truly attracted to someone, then a simple date isn't that big of a sacrafice. You can start small with a coffee date which doesn't take that much time out of her day or go on a full blown walk in the park, it doesn't make that much of a difference, but don't blow too much time or money on the first date. You don't even know if you click.
Now, if you're going in for the quick lay, you'd try to make a connection as soon as possible, you try to maintain it as best you can, and you get to it.
But if you really want a real relationship, I think it's much better to get her to do something new. Pursue you. Miss you. Want you. The typical thing that most AFC chumps do to women. The kind of AFC chumps that are the womanly men that women describe in the "What I look for in a guy" section.
Now, I'm not completely disagreeing with JT's advice or what he believes in. I'm sure it's worked well for him and would work for many other people, but my beliefs towards dating is that in order to maintain a relationship, a woman must have the time of her life with you and be missing you into sadness without you. Talking on the phone with her for hours just says you could be with her, but instead you have nothing else to do and don't mind sitting miles apart and conversing without the kino, eye contact, physical dating. It basically says that you want her and you hope she wants you back. I still don't believe in giving women more power than you yourself have.
It really depends on what you're looking for. If you're willing to invest that much time into a woman over your daily life and seemingly pursue her, then I'm sure you can just snag the lay. But if you're looking for a real long term relationship that some people strive for, then I think setting limits on the things you do is perfectly fine. Don't call her, she has your number if she wants to talk to you, use the phone to set up dates for real contact when YOU are free. Don't spend hours on the phone with her, you're a man, you have better things to do than sit around and chat it up.
I don't think it matters if a woman loses an emotional state when she isn't with you. If she's interested in you, she'll recreate that emotional state when she's with you and even more powerful of an emotional state if she has missed you and finally gained contact with you. When you get finally get something you really want, it's worth a lot more to you. It's the same way with women. The more they miss you, the more they want you. The more fun they have with you, the more fun they will want to have with you. The more you're apart, the more they want to be with you. Catch my drift here?
This woman seemed to have pursued you and wanted you when you met her. You weren't even with her alone or for long. The intial attraction was strong. I do not see ANY reason why she would not still recreate that attraction when you call or sees you. So my advice?
Call her up say, "Hey, I'm free Thursday night, let's go out to dinner, I'll pick you up at 7."
Simple direct. If she rejects then she is plainly not interested. If she counter-offers then she is interested in the date and still wants to go with you, but there is something in the way. Politely tell her you aren't sure if you're free that night and call her again later and ask for another night. It's all about being in control of the situation and yourself. Not letting her affect your life. You are a man, stick to what you do.
Good luck.