My Yr 3 DC and I have just finished reading Heidi tonight which we really enjoyed.
We are also Heidi’s fan in my family. If your DC really enjoyed this story, maybe he/she would like to go further by reading a sequel written by another author? Heidi grows up
by Charles Tritten... and there is even Heidi’s children
In the same genre, there is Pollyanna
by Eleanor H. Porter. To be honest, I don’t know how the difficult the vocabulary would be for a year 3 / 4 child as we haven’t read it yet. We’ve just finished to watch the film today and my DS (year 6) is all excited by the film and wishes to read the book.