I don't think many girls are going to tell you that yes, they want to be kissed. That makes them seem eager at best, slutty at worst.
I do think that she's interested, so definitely call her up and invite her over. This time, instead of asking, start off with a small kiss somewhere, like on the back of her hand. If things go well, kiss the back of her neck. If things are still good, you can either go direct for the lips or you can stop by her palm first before moving on. Just don't ask. You seem like such a n00b then. Few people want to feel like they have to train their partner, so keep a stiff upper lip and act like you know what you're doing.
Good luck, and let us know how things pan out.