There could be so many reasons for her reacting that way. Like bhumi wrote...may be she is uncomfortable talking about it so changed the topic to herself. Maybe she has far too many problems in her own life. Maybe she did not understand that you just wanted to be heard. Times change and peoples priorities change....relationships change. Don't lose a good friend just because she wasn't there for you one time. You probably are not there for her in her troubles. You both are in different phases of life. Who knows....someday you both may have more time for each other and can come close again. Good friendships are hard to come by. Cherish the friendship even if it doesn't pass all friendship tests.