ragtimer not sure why I posted that twice, it must be my phone playing up!!
Yes it was difficult, also she had made some lovely friends, nice atmosphere and lots of very inspirational professionals. One of the problems I did find, which not many people warned me of or liked to talk about, is that your child may not get on with their main instrument teacher and this can cause a problem. In our case it was sadly more the fact that the teacher was really quite poor and very inexperienced, which I thought was strange in such a setting. It was very hard to change, in fact the change never happened but they blamed my DD1 in the end rather than have a serious look at the teacher in question (typical).
So this really made us look again - some people who had the same teacher had additional tuition in the week for that instrument to compensate, which I thought was absurd!
My DD1 still wanted to stay and was sad to leave but when I looked at the pros and cons and how much it was costing in both time and effort versus what she was getting out of it it wasn't worth it.
For those who say their children do lots of other activities, it isn't the same. My DD1 has always done 4 hours dancing every week, county orchestra, two instruments, etc but going there was an entirely different experience. It isn't the same as adding a few hours of activities, because not only it adds workload in the week but it takes out a whole day at the weekend.
Finally, I know some children who are very good/successful musicians for their age (think grade 7 age 9/10), who have not attended such places and still are doing incredibly well, so it isn't a pre-requisite to doing well as a musician if that's important to you.