You have to find a way to attract her attention/interest, make her come to you, dont be distant, become important, its a good thing she answers right away, (r u sure she is "available"?) that means u already r a bit of "important/interesting" to her, find out y and serve it wisely...
insist, gently though,
i advised a friend of mine, about a similar case, he had him, sending sms for a whole moth, he eventually became a part of her life, she was addicted and when they finally met, she was ready...