That's not 100% true, actually.
TAT allowed Mao to chose between two pieces Bells and "a soft Liszt piece", probably Liebenstraum. Mao chose Liebenstraum. But, as they went through the choreo, TAT said that it's too soft. Mao initially disliked Bells and said that it's too "dull" and difficult to skate to. But eventually she agreed and said that she grew to appreciate the music's rhythm and the feeling of "something bubbling from the underground".
Mao also chose Caprice for her SP, but TAT said it's better as an EX. Mao initially didn't want to use the same music 2 seasons in a row, but agreed when she heard the flute version. (For some reason that was not given, Mao never actually skated to the flute version).
It needs to be said that TAT believed that the programs need to be changed if they won't work. After TEB Mao said that she'll change the programs when she feels like it, like she did with Yagudin before Worlds. But TAT got a surprise after Rostelecom Cup - Mao refused to change her programs. Later, before NatIonals, she said that she can't change her programs because memorizing the choreo takes too much time; she spent weeks polishing the programs and "there's no coming back now". And actually I agree - Mao probably needs every free moment to work on jumps, because even the most beautiful choreo won't help if she messes up half of her jumping passes.
I must say I'm quite disappointed after Nationals, though. There was so much choreo removed from LP that only the required technical elements are left... and face-slapping, which I always found silly looking in the first place. If there was enough time to modify SP (actually, the changes made in SP were very good, I think) I think the time spent on that would be better spent on changing the LP to Liebenstraum or going back to an old one. Frankly speaking, the choreo in the LP became so sparse, that it could be as well executed to different music. And, hopefully, there would be no time to go to Russia to have TAT design the costume and someone in Japan would take over the job. The current LP costume literally makes my eyes bleed. The costume used at Japan Open was much better - why Mao can't at least go back to that one..?