b1uesky: "I was on a music forum awhile back and most parents there said they would make the sacrifice and send their child to this school"
Well, the thing is, it's not really their - or your - sacrifice to make, is it? Now if your daughter was able to decide, sensibly, that she didn't mind being deprived of your presence and company for most of her childhood in order to help her do slightly better at something she may not enjoy, fine ... but can she? At 6?
OK, my bias is showing. Don't do it. If she turns out not to want a musical career she'll hate you for it. If she does turn out to want a musical career she'll probably still hate you for it.
"I think with my decision I will have to be realistic and give up any hope of dd ever becoming a great pianist"
OK, to be brutally frank, why should your hopes matter here? Six years old is far too young to decide what a child is going to be. What if she wants to be an engineer who plays the piano for fun? Or a violinist? Sending a child away from home at seven in the hope that she could then fulfil a parental dream is not, I think, a particularly nice thing to do.
Mind you, I can imagine that music forum parents might think it a good idea. Some of these people would sell their own kids' livers if they thought it would move them up a chair in the violins ...
And anyway, she may well still make it as a musician (horrible job - rotten pay, nasty hours, no security, much nicer to do it for pleasure) if she stays with you. If she's that good, as others have said, she'll make it!
I used to go to ballet classes taught by an old friend of mine. One of the pupils was a 17 year old of staggeringly high ability. I'd kill for feet like those. She had places lined up at about four Big Name professional training schools ... then thought about it and said no, she'd rather dance for fun. She's now studying medicine at Cambridge, and doing jolly well, from what I hear. Isn't it a good thing that her parents didn't focus exclusively on her dance skills from the age of 7 ... ?
I'm glad you've decided not to send her.