It is not THAT complicated.
You had two dates, you barely kissed. Now her texts are lame and short.
WHAT IS IT THAT YOU DONT UNDERSTAND? she is not interested in you.
If she was...it would have been like this:
Day 1: you kiss or make out.
Day 4: she texts you saying good-morning. You go on a date. You make out or have sex.
Day 8: you text her, she texts you back enthusiastically. You go on another date you have raw sex.
Day 14: she sends you a selfie, you ask her out, she agrees.
etc
etc
You get the point.