Re: I need help on how to respond...
Is that the actual smiley she used? If it is, sorry but it doesn't look good. She might not mean harass 100% negatively but if you're trying to text her every day, she might not always want to talk. It's hard to tell sometimes with girls right away what kind of texter they are but if you have several short conversations with delayed responses from her, she might not want to text much. If that's the case, try setting up a meetup with her to talk in person instead.
As for this situation, I'd go NC for a week then try and make plans. If she's flaky at all, just drop her. An HB6 isn't too hard to come by or get so you'd be better off just finding in new one.
You are the prize. She needs to earn it.