Aliona Kostornaya, of course, is not a model of exemplary behavior and strict discipline. Nevertheless, it is impossible to say with absolute certainty that this was the reason for her failures. Already in the spring of 2020, that is, before moving to the Angels, Aliona lost her triple axel. I do not exclude the possibility that the fall and winter of 2019 was generally the peak of Kostornaya's opportunities, and all paths from the top, as everyone knows, lead down. There would be nothing surprising in this - in the end, Alice Liu exhausted her resource much earlier than Aliona.
It is difficult to analyze all this precisely because Aliona decided to change her coach. I have listened to many of Aliona's interviews about this and I can only say one thing for sure: this decision was impulsive, ill-considered and therefore unreasonable. In addition, Plushenko showed himself to be a frivolous and irresponsible person. I hate to talk about it, because he is a great skater, but what can you do. Almost no work was done with Aliona. She was given medical help, she was promised the best choreographers, but she did not receive real attention from the head coach of the headquarters. Moreover, later, explaining the failures of Aliona, Rudkovskaya stated that Plushenko did not train her at all. All this coincided with the ridiculous decision to abandon the general physical training of athletes (this "brilliant" idea belongs to Rozanov, but the decision was made by Plushenko).
As a result, Aliona lost the whole season. And the loss of the triple axel has become almost irreversible.