Sounds like she might be interested. A "we'll see" could just be a way to see how keen you are. It could also have been a way of nicely saying "Bugger off you twat, I wouldn't go out with you for a million quid!":rotfl: All you can do is have another shot and if she finds an excuse then move on. If she's still playing hard to get, then you are still in with a chance.
Keep going.