Why does my ex-girlfriend still sit with me at break and text me everyday since I broke up with her?

I broke up with my ex on Friday, because she keeps blowing me off when we're supposed to do something together and we haven't done anything together in a month so I broke up with her. I told her obviously you don't respect me and obviously you don't want to do anything with me so I'm done. Her response was I jave yo go to the office so she took off real quick. We work together, and on that same day she sat with me at break and texted me Hey and You busy, then texted me last night after I was in bed asking if I'm sleeping. Friday after work I flat out asked her when did she decide that she just wanted to be friends, and she said she never decided that she just wanted to be friends. I'm confused, what is she likely thinking?