No, I didn't mean initially, I saw that. What I meant was I meant to explain it completely, the whole situation, everything OP is unhappy with, at a time when the teacher couldn't fob her off or pretend she was caught on the hop. I think you misinterpreted me.
Something along the lines of the lessons are always short, she's paying for 45 minutes, she's upset she's regularly not getting it, her DD isn't happy with x and y, and to say she is thinking a change about a change of teacher because of it, and is there any way forward.
To be honest, the pieces don't sound unsuitable as such, just that they aren't suiting the child at the moment - something the teacher needs to be told. Some children love tackling really hard stuff and are motivated, others are intimidated and put off. The teacher should judge this better, yes, but often won't know how a child is reacting at home if it isn't said. I've had parents phone me and tell me a child doesn't like playing x and I've had no idea because the child has always seemed really happy in the lessons. I always say, of course they don't have to do a piece they don't like - but I do need to be told.
The orchestra situation is just one of those things, I'm afraid. 3rd violins is like corps de ballet, very annoying and tedious when you know you can do better, but good for you in a way you won't appreciate until much later. I'd stick that out, she won't be there for ever and it's something that will definitely improve. They pretty much have to put her there to start with but she won't stay there too long, I'm sure.
Before I'm flamed for defending the teacher, the teacher is definitely in the wrong here, there's no doubt about that at all. But I suspect she may not be thinking about that if her time management is poor and with a very direct discussion it might be resolved. After all, it sounds like there are good points if only the issues can be sorted out - and a different teacher will always create a slight loss of continuity. Sometimes it is obviously the only way, but I would say that even with the best teacher in the world a child will lose about a term of progress whilst the new teacher and student get used to each other.