There's plenty of scope for improvement but the playing is commendable especially for the age. I'm curious why at such a young age is music like from Ligeti is being studied? Given the short amount of practice each week I'd think there's room for more engaging works.
Conventional practice/teaching doesn’t really work for her.
Right now, in terms of composers, she enjoys Bach and Ligeti the most. She generally dislikes the Romantic era, except for Grande Valse Brillante (thanks to Tom and Jerry). She hates almost everything by Chopin. She also dislikes most Debussy, Rachmaninoff, Alkan, Chaminade, Méreaux, Shostakovich, etc. As for the Classical era, it really depends on the piece.
If it were up to her, she’d be practicing Mazeppa, Spanish Fantasy, Arabesque on the Blue Danube/HR2 (again, Tom and Jerry), or Bach’s Contrapunctus 2. But obviously, her teacher and I vetoed those ideas. While she can reach a 9th, or maybe even a 10th, there’s no point in taking risks, and she’s not ready yet (C2).
These days, we mainly get two types of feedback : teachers who know her say this piece is appropriate for her, while teachers unfamiliar with her context will obviously say it isn’t.
My gut feeling, it would already require 8-10h practice on a weekly basis and just for this piece over a period of 3-4month+1-3months to polish it for a conservatoire studentnto achieve a convincing performance, here, I am unsure where we are and if we are in a sunk cost fallacy or if the progression is normal given the weekly practice : at most I'd say 20min/45mi, depending if weekdays or weekend, 4 times a week on Ligeti pièce itself.