This is very simple. Your text message could easily have been mistaken. She may sincerely believe that you are actually pissed and no longer want to see her, even if your intent was to elicit a teasing tone of voice. The problem with text, although it is awesome, is that you lose that element of paralanguage (i.e. tone, rate of speech, pitch, inflection, etc.). So it looks like that is what has happened here.
You need to bridge that gap between actual convo in person and text. She was expressing a sincere apology. She has already put herself out on the limb, which she should have, but you cannot push her further away, especially if it is ambiguos in text. For this reason, you were right in teasing her (i.e. give her a lil push), but you need to say in the same text message something that will pull her back in.
For example you could have added, "I will never speak to you again : ), but since you are so cute I can give you one more chance, but only one more. "
At this point you have missed out on that possibility. I would explain to her when you next see her that you still want to go out and that shes such a dummy for not realizing that you were kidding. Do this with a lot of energy, a huge smile, and anything that would be congruent with that attitude. Remember that smiley faces and texts, or lol, can be used effectively to bridge the gap of paralanguage. Don't over use them, but a simple smiley face may have been wise there (sorry if you did use one, i can't remember now that I am writing). Hope this helps.
-Ben Reed AKA Breednow
www.breednowornever.com
Breednow-or-never (Dating Advice for Smart Men)
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Ben Reed is a life coach and social dynamics expert originating out of Philadelphia, PA.
-He currently is launching his new website in june:
www.Breednowornever.com