It's not just the musicality that sets her apart though, even from Kamila. I think Anna is the most musical, but both Kamila and Sasha have good musicality. Another huge difference is that Anna is always invested in her performance. You can tell that she isn't just there to do her technical elements - while most skaters focus on the jumps or spins first and then perform more when they're done, Anna is performing during and between her elements, from the first note of the music to the last. The choreography, transitions, and even jumps add to the program and are integrated to interpret the music, she never phones it in. She can mess up jumps/spins but she's always giving her maximum in the choreography where as others let it affect the rest of their skate, or you can tell they're just going through the movements until their next jump.
Musicality is innate but her PE/INT also comes from other areas. Anna has the natural ability and she isn't more naturally musical today than she was when she was 10. But, she's also put in tremendous effort over many seasons to make her an artist who doesn't only focus on tech; her movements are more refined, extended, and have more intention. It pulls everything together and that should be rewarded.