Kinda sorta. One of my sorority sisters called me anxious about a new project she wanted to do. We talked on the phone for a long time about it and when I would see her I would always encourage her. Well, she did not follow through on the project.
People are people, letters or not. You would hope that since you both have similar backgrounds - school, sorority - that she would value those connections like you do, but for some reason she does not. All in all I would not get too angry about it. You did what you could do and you should feel satsfied knowing that.