well, you can use all your conversations in order to DHV yourself.
Try to find out what kind of girl she is, and if she is, for instance anti-drugs, you can always use the DHV routine "cracked girl", not sure if posting links is legal, so if you want i can PM to you the link of this routine...
Just find out her interests and DHV on it..
Try not to be boring.
There's no need for a BIG conversation in order to be interesting..
Just say funny and unexpected stuff...
Last time i Text-gamed a HB(I'd say

, it started it "Do you know the Smurfs? 'Cause I don't and want to "

Makes no sense, will probably make her smile, it's PUA basic principle: be different from anyone else.
We texted intensely for two hours and I was able to develop a lot my emotional connection..
If you can't transition into a interesting, lasting talk, just say the odd thing you want (asking something that makes no sense, she wants to know what you mean by it, and you don't explain, say you already got it or whatever... keep her intrigued! ), thank her for answering, or say you felt the NEED to inform her (be funny!) and end the conversation.. That will keep her thinking about you while she tries to understand what you meant. Be mysterious, not nerdy or weird. Ambiguous stuff work better
Hope it helps