Langlang is a wonderful pianist, but at what cost to his personal happiness and stability? What his parents did was harsh. Perhaps they had very little choice. It was their way for their son to get out from poverty, and he clearly had huge talent. You tube is choc-full of tigered tinies plonking away very efficiently at Grade 8 Bach aged 6. But they have no connection to the music's emotional range. Langlang's playing is very engaged emotionally.
Imho, the best pianist ever is Alfred Brendel. He taught himself from scratch aged 17, because he wanted to. It shows in his expression. No one has ever mastered Beethoven better than him.
I think hot housing is soooo wrong. Long term it doesn't matter if a child has A* A level maths aged 10, because once he's 18, his grades are no more impressive than others who attained the same grades at the expected age, but who also had a childhood. And those who progressed without hot housing - their social skills will be advanced and may lead to them getting better job offers, having better personal relationships and better lives all round, long term.
My DC are encouraged to do their best, but not pushed, and certainly never at the expense of having a life. Their lives are full of films, friends coming over or dropping by, visits to relatives, trashy tv, playing club rugby for fun, you tube etc, and they get good marks. They're not top of the class, but they're near enough that if they want to put their backs into it when exams are near, they'll make the grade.
Then again, some people think tweekly utoring for 11+ is hot housing. I think that's taking cool-housing
(for want of a better expression) too far. If 1-3 hours per week extra effort from a 10 year old, to ensure they get into a really top academic school is too much, then I think parents are discouraging their children from ever feeling the healthy discomfort of making an effort.
It's a question of balance, isn't it?
OP sounds like you did the right thing. how lovely that the spark is back in her eye. Music, sport, art, specialist study should all be pleasures. Excellence in anything should be led by the child. Lots of kids are driven to overachieve, and that can be supported without being driven by the parents.