can you translate this action?

Ok. I had plans with a girl that I am dating for Saturday night (Note we are not officially a couple yet) and I get a text Friday night that she is on her way to Miami with her friends and that they are going to a concert. She said that we will have to go on a date later and that her decision was a spur of the moment thing. She finished it off with take care and reminded me that she will be thinking of me.

I am bothered that she just took off and some of her other friends were just as shocked as I was. Does this mean that she doesn't care or is it some kind of last weekend as someone single before we get into a committed relationship? If it helps, we did go out of Valentine's day.

Thanks