Is she turning me down or my approach?

context - (20M in uni) It has not been very long since I got to know that she even exists, This is mainly because she hardly attended any lectures (important cue for later). However in the process of finding one member for a group project which we are currently working on, she got added in my group which I am leading.

She has been very cooperative and responsive to me is all I can say. Hence I didn’t spend much time analysing paralysing and asked her out to study together on a day which she never attends. I did that because that particular day’s timetable provided a good opportunity to spend time together. When I asked her out to do that via text, she enthusiastically agreed. However the night before the day, she sent me a text she would have to skip for Tomorrow cuz she is not feeling good and 2 hours of commute wouldn’t help it. I responded calmly saying whenever she feels good she can let me know so we can chill sometime. She said yep I will let you know.

Now I am unsure that is she politely rejecting me or turning down my approach?