I think a lot of people don't accept that #3 is a real "thing." Women are very emotional beings and very in-the-moment. If they are horny right now, it means, RIGHT NOW. If the only reason they are talking to you and agreeing to see you is because they are horny and want sex, that is often not something they are willing to "schedule for a few days later." Depending on the girl, how crazy she is, and her emotional stability, sometimes her "mood" will last for 5 minutes. Sometimes 5 hours. Rarely a day or two. I'm not describing stable girls who are looking to date seriously or have a serious relationship here. I'm just talking about crazy girls who live one minute to the next and there are many more of those out there than most people think, especially girls under 30 but it's not totally uncommon to still see that in women over 30 too.
For these crazy in-the-moment women, alcohol (and sometimes other drugs that are anti-anxiety like Xanax) can often be key explanations for their behavior. They drink to calm the emotional storm and just let go and act on their horny impulses. If a girl is drunk or tipsy when texting you and wanting sex from you, you can guarantee the second she sobers up she will be in a TOTALLY different frame of mind and sex will be the last thing on her mind. If that's all she wanted from you in that drunk moment, you now serve no purpose so there will be no further communication (until she gets drunk and horny again).