TL;DR What do you guys think about a chick not responding to when get asked out and she seemed really interested? Passive shit test?

A chick approached me, we went to high school togheter.

She approached me, said I looked different with a smirkey face. I got a beard and muscles now.

We chat for 30 min, joked, push pulled etc. Went really great. She is usually an introvert but was really on fire and interested in me.

Asked if she wanted to do something later, she said imidiately "yes, don't have much going on now, would be great."

texted her a day later, if she wanted to grab coffee downtown with me. She saw it but never replied. I will text her again about something else. She seems to be the girl that gets nervous on dates, date anxiety etc.

We don't talk much about passive shittest here, but they are real. It have happend that asking a chick out and she says no only cuz she wants him to try harder.

What do you guys think about a chick not responding to when get asked out and she seemed really interested in me and she approached me? There was no reason for her to stay over 30 min talking to me, we barely knew each other at school. Do you guys have experince from this? A chick going cold cuz she wants you to try harder or she is nervous? In "Get laid like a warlord talks about this.