I think you waited too long. You went out on a date and waited 3 days before you texted her. Then another 3 days before the next text. I know we PUAs run our game based on rules, etc., but they are only guidelines.
Regardless, seems like she'd been waiting on you when you sent the first text after 3 days. You two were playing and joking around -- I would have said something cocky like, "yea yea I know you've been thinking about me nonstop since our date. Tell you what, I'll put you out of your misery and take you out tonight...." or some variation of that. Lead her. I'm 90% sure she would have said yes. Go for some activity oriented date like bowling, etc. Something fun where you naturally come into close contact -- lots of chances to kino, kiss, etc.
Seems like her excitement for you fizzled out. What next? Move on to the next one. But, send this one last text to the HB9:
"Hi, not sure what happened. I hope I didn't do anything wrong! If I did I'd like fix it.

I'm good at fixing things. But I won't pester you. If you change your mind or want to hang out just let me know. I would love to see you again. But if not .... well that's just fine too. Take care."
TRUST ME. It works 60% of the time to at least get her responding again. I'd only send it after 5 to 7 days of no communication. If she does reply, setup another date. If she doesn't reply, you've already moved on!!!