Can she maybe not do a lutz in the SP? She just can't get that program right.
I have thought about recurrent mistakes like the lutz that seem impossible to correct. How can a skater do well in one program (FS or SP) with the same elements that they crash with in the other program? Why is this condition so hard to fix? There was a discussion about two years ago in another thread that focused on skaters' reliance on auto-pilot during performances. Sports psychologists know that athletes in many areas, especially areas involving performance such as figure skating, do not think while competing. Skaters often talk about this mental state of being on auto-pilot. Some claim that they can't perform if they think. It would follow that if there were some thoughts that interrupt the auto-pilot sequence, then the skater would make a mistake at that point. Skaters also talk about success in practice but failure in competition. That again supports the auto-pilot disruption theory. Recurrent mistakes of this type have little to do with physical ability (the skater is okay in practice and okay in another program), it is some psychological disruption that is triggered by a specific thought or circumstance. Think of it as a bug in software. The more this happens, the more the skater is spooked and the more likely it will happen again. I have no experience with athletes, these ideas seem to fit what we know about these recurring, contradictory, difficult-to-fix mistakes. It stands to reason that this ought to be corrected as early as possible. In Nastya's case, some of her mistakes may be related to disrupted autopilot, and some are related to technique. She is fortunate there is plenty of time to work it out.