AITK for not helping my friend when she called ?

I have always been isnvurea bout friends so I just stick to people for long time even if they don't want me to . As for currently I'm friends with this group of 3 girls neither of them calls me to join them for any fun activity they do any hang out but only remember me when they need me to do something for them mind it we see each other daily but they only and only talk to me when help needed Today we were being given our exam forms after 3 PM and she called to know about it and i told her that they r being distributed. So she asked her real , close friends to collect it for her it was already 4 PM by then . But they came collected only theirs and left. she and her close friends don't live in dorm but I do so I was close to the administration department. She called me to go and collect it for her after 4 :30 . department closes at 5 . I was exhausted cause it took me 1 hour to collect mine i came back to my room at 4 only and had changed out of uniform by the time when she called I told her that I won't go i am sleeping and cut the call on her face now she is mad at me as of why I didn't help her AITK for not helping her ?