That sucks. Instead of enjoying what could be a once-in-a-lifetime chance to enjoy Cheech and Chong together, you're mind is split, waiting for her to show. How was the show?
Now it could be that she texted you because she's a coward and didn't want to interact with you when she told you she wasn't coming. Or because she thought it would be less disruptive to the show to not have to force you to the lobby just to tell you that.
There's just not enough detail here to guess at what's going on. Others seem quick to dismiss her. But real emergencies do happen and sometimes, new relationship or not, you have to take care of priorities and put other things on hold. If that happened, she should have told you what's going on.
Did she say why she was running late? Is she on-call? Did she have a work situation to deal with that she thought she could resolve, but it kept taking more time? Some other crisis?
You obviously don't want to be a pest by calling and calling, but not returning your call can happen. Maybe she's bad about listening to messages (a problem I have). Does she have a roomate that might have listened to/erased the message and forgot to tell her? Maybe she feels really guilty about missing the show and is scared to face you. Is it her cell? She could have left it at home. I did that twice last week.
If she's not answering the phone, wait a while and call from some other phone so that caller-ID can't identify you to her and see if she picks up.
Either because I've been swayed by others or because of the info you've provided, I'd kind of have to agree that she stood you up for no good reason.
Take an honest look at the situation. Sure, you talk a lot, but is that because she needs a friend to dump her baggage on? Or because she's interested in you? How much of the conversation is about you and not her? Maybe she only considers you a friend and doesn't want to lead you on.
If she had a good reason to be late, she should have explained why. But you haven't mentioned it, so I'm assuming she didn't. Could be something she's embarassed about. Couldn't find an outfit to go out in that looked right. Couldn't line up a babysitter and hasn't told you about her 8 kids yet. Doesn't own a car but doesn't want to look pathetic and her friend who was supposed to loan her one never showed up. She was supposed to meet you. She didn't ask you to pick her up or come to your place. That says something. Maybe she's got a husband or boyfriend living there. Do you call her at home or on her cell?
The other reason, as some have said, is you were the second choice. Might be another guy or might be her girlfriends begging her to come with them instead. Vs. you, which she might only consider a friend that she's worried about leading on.
So, she made her choice and a promise to take you out to dinner so you wouldn't feel bad, but doesn't intend on keeping it. Or will, on a night when she doesn't have "better" options available.
Put some brand new batteries in your BS detector and see what she has to say. Proceed with caution.