I'm a little confused, is the orchestra teacher a violin teacher? And what are the arrangements for lessons? I have to say I can't think of any success stories for group lessons for violin at this kind of age; fine to start with that and see whether she likes it, but I think you'd have to plan for going to individual lessons quickly or she will either get into bad habits that will stymie her playing long term or get frustrated or both. I definitely wouldn't allow any child of mine to be taught violin by someone who wasn't a qualified and experienced violin teacher, but I doubt one would take a violin pupil anyway so I guess this is a violin teacher who also takes orchestra?
Instruments really need daily practice (maybe only 10 mins to start with, but it ramps up) to make the lessons worthwhile; for DS8 we've decided that two is enough (he plays piano, and currently has singing lessons which he will give up in the spring in favour of 'cello lessons, though he'd really have preferred to keep all three). Maybe three or even four might fit in an 8yo's life that was less full of school than DS's is, though. If Butter gets serious about music then learning piano would be a really good idea; I'd definitely add that next rather than going to flute.
