apparently she was trying to connect with you again. especially that you left her!
so if you are still interested in her. and you think things would work out between you. its already a week past. so do the same thing with her. text her " HI" and she would show you what expected you to do.
but just do so if you are going to come back together. if you decided she is not good for you. just try to forget about the text( I know its so hard, but maybe its easier than being hurt of a not good relation later)
I'd still find out what she wants. If she asks you for something then you will have justification in leaving her. If she seems to have made an effort to change there's no harm in giving her a chance if you still care for her, but be wary. Change is usually an illusion, and almost never true.
She is likely trying to see how you will react, because she still thinks about you. Text her back in about a week or so and see how she responds. If she texts you before then makes sure and just call her after that to see what's up with her for real.
She wanted to see if she still has power over you. She took you for granted, but knows you still care Now that she got her ego boost, she still knows that she can have you anytime that she wants on her terms. She wants you to chase her. Girls get a kick out of stuff like this and do this all the time. Move on, ignore her, and start dating other girls.
you should have responded with a "hey what's up?" or something at least there's something she could've responded to and you get a jist of what she wants. seems like she just misses you and wants your attention