Hi JoJo,
Don't forget that the 1/2/3 class will have normally developing Year 1s who will likely fall below your daughter's ability levels. If your daughter is in the class as a Year 1, she won't be expected to do the work of or behave like a Year 3.
Also, environment does play a really big role. If your little one has the example of children who know the routines, know what's expected of them & do the work, she is more likely to follow their lead & show her abilities than if she's in a class where the other children are still learning the basics.
That's not to say that the Pre-Primary/1 class won't be enough for her, just don't write off the 1/2/3 because of worries about those Year 3s being in the same class. The best thing for two of my boys was the ability to be in a combined Rec-Year3 class for those early years, allowing them to do work at a higher level & having the older children to interact with. For my oldest this came after a year of dumbing down in kindergarten to fit in, and the second was early entered at 4 1/2 into the class. It worked for us.
Good luck,
cassandra
