I used to do karaoke with the kids at school once a year and I actually found that if you remove the vocals kids don't know how to handle it. I realized at least most kids want to actually sing along with the song versus just singing it. Obviously, that isn't the case here. Just as long as she still has contact with normal people. She's probably going to run into far more of those in her life than advanced people.
I think it is the same for Smallsteps at this point, because she doesn't have enough knowledge on how the song should sound from the words alone. Though, it is pretty incredible at how much she has improved in the last few days.
I can only imagine. Kids minds are so adaptive at that age. I can sense your pride!