It was very comforting reading all this wonderful things about her. She is my favorite skater ever and to be honest, while I understand her decision and think it is the right one, I still feel like she always got the short side of the stick in this sport. Just look how the ladies were scored at this last World championships and how lenient the caller was despite some very obvious UR's (like Karen Chen's combo), and remember Mao got credit for just 1 out of 3 perfect 3A at Worlds 2010 (back then, an UR was basically a downgrade point wise - so she got credit for a 2A with negative GOE for perfectly executed 3As). And now, just look on how Medvedeva and Pogo get full credit for their flutz and, respectively, lip, while Mao has been (rightfully so) always called. But Mao had to basically rework her jump technique in order to be competitive.
It seems unfair that after years of hard work, after she become a lovely all around skater, she still got crap PCS and overly scrutinized for UR's while the youngsters prodigies are showered with huge PCS and lenient calls. I remember reading a comment during Worlds, when someone said regarding Carolina's SP that if Mao skated the same program, she would have been most likely buried in the standings. And it is true.
Add to all the above the injury and age, and the realization that the Olympic gold will never happen for her, her decision was correct. I just feel that the current judging system played a big part in this decision. And it is a shame that the sport she loved so much is the one who basically pushed her into retirement. I don't know if we will see in the near future a skater like her, probably not. We are in the era of full back-loading and tano-ing jumps, with rushed movements and bad choreography who get huge PCS based exclusively on TES merit (this was confirmed by the results of Jr Worlds, where a clean Alina comfortably won over a clean Marin, both girls being virtually tied on PCS).
No room for a skater like Mao I am afraid in the current judging system. Or at least not at the top.
I hope she will be at peace with her decision and continue to be involved in this sport, one way or another.