When a girl says she'll text later but doesn't?

Had a date with a girl 3 days ago. She didn't have a regular cellphone number, so we use snapchat text too get in touch. She answers my snap texts instantly. Date went well, she invited me after too hangout but I had work. (Damn!) She said it was fine feel free too message me anytime. Next day, I invited her too come join me at Subway but she had class. So I gave it a day, just too give her space. Snap texted her, and she replied instantly, like always. She said she was drained and tired, wanted a nap, so I said Alright sure, you can message me after if you want. She replied with Yeah alright, no problem. That was 4 hours ago, and nothing. What should I do at this point? Keep pursuing her? I really want this too work out.
When a girl says she'll text later but doesn't?
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