Don't dead it, there are too many unknown factors as to why she may have these spells of non-response; and if your main goal is just for sexual companionship then it's not worth dropping her just yet. It's simply time to fall back a little. The key is to continue pursuing her, but at a slower pace, and just as nonchalant as she is. Don't even mention the fact she never replied to you the next time you text her, and yes, I said YOU text HER..as in first. She should always, from this point forward, have the impression that you don't necessarily 'need' her and aren't some 'thirsty' brother who's desperate. So by brushing off those little games, texting her first like you were so busy with your interesting life that you didn't realize she never replied, you will come across as if you were either too confident to let it bother you or was too busy with your interesting life to notice, either way it will began to pique her interest again. And make sure you sound as happy as a fakkit in boys' town in your next message to her, as if the two of you just spoke yesterday and your life is great. It would've been better had you done all of these little things the very next day but it is still not too late. But back to the topic, from here forward do not initiate anymore meeting up. You have to remember, YOU are the male, and due to mother nature you are automatically in the proverbial 'drivers seat' when it comes to women..you just have to play on our strengths(detachment, passive aggressiveness) and a females weaknesses (attachment, loneliness, emotional, validation). This tactic takes patience but is HIGHLY successful. The key to being successful with this tactic of passiveness is to have something on the side. It is very hard to have the patience and nonchalance it takes to successfully apply it if you have nothing to 'distract' you(other women, even if you are simply in the pursuit stage with them as well). That will allow you to go a night or two without hitting her up and/or being in agony thinking about her and trying to resist hitting her up. She cannot be the only one you think about, or else this tactic of passiveness will never work because you will show too much of your hand to her when you communicate with her. Long post, and there are still many important details I am too tired at the moment to mention, but I hope you get the gist of what I'm saying. Take back the driver's seat, you are the male, you control the momentum; right now she is, and the only way to get it back is to fall back. But again, it's a fine line between falling back and out of sight out of mind, so you must continue to hit her up at least every other day for casual conversation etc..just do all you can not initiate the next meet up, you have to come across as: 'Yes I would pipe you down in a heartbeat but no I don't really care if it ever happens or not.' Good luck.
that's why I support a one date maximum until they prove themselves to you by returning the favor so you know it's real. fukk all that extra courtship.
Science