I JUST WANT TO KNOW...

Today,my friend,jharana whom i had known for 2 years scolded me...we had a fight a few day ago,it was not serious...we fight as in we told each other bad things...than today,she acted like she didn't know me in msn so i called her up at her house and when told her why did that,she scolded me for call her for no reason when i had a reason...i just don't know why is so angry...we had fights a lot of times before but she have never done anything like that before...i don't understand anything...i just want to understand and i want to know why she is doing this...