I absolutely agree with what everyone has said so far! This woman really went above and beyond in her pursuit of Sorority A, and I think it is awesome that she found her home after all this time. While it's true that some of Sorority A's members may be sad that she is not their initiated sister, this is through absolutely no fault of her own and it doesn't mean that she loves or cares for them any less.
Also, for what it's worth, I pledged one sorority when I was in college and ended up becoming an alumna initiate of a different group.