I advice you to talk to her and know why she did so . may be she have any bad conditions . dont but ur judgements without knowing the reasons .
If she dont have any reasons which you accept so you have to take this as an experience to you in your later realtions . and you have to know that not all people bad and not all of them are good . in every where you can find the bad and the good .
:D forgive your friend and treat her as normal as the past time.
people always complain their sadness to their familiars and forget to share their happiness with them, they regard the familiars as the closest person. they would not be accused