Thanks. I am sure the abrsm app would help but not necessarily solve the problem as she needs to remember more effectively which string each note lives on! Her teacher thinks she gets a bit confused perhaps because she's left-handed
My dds teacher covers theory in the lesson, as an ongoing part of her musical education. She does practice on her own but teacher does the explanation. Is your teacher doing the same, I ask as it seems pretty standard to all her instrumental teachers.
For sight reading (notes and rhythm) this book is excellent - repetitive lines of music to remember notes - designed for Suzuki students but can be used by all. I have got Vol 1 for my daughter who is approaching grade 1, but it covers grade 1 & 2, so I imagine that grade 3 would be covered by volume 2. http://www.amazon.co.uk/Can-Read-Music-Vol-Violin/dp/0874874394
Other good theory books for general theory are the series by Lisa Ng.
Sorry - don't know any good apps but will look out for other responses on this thread.
My DD is about to take grade 3 violin and her teacher thinks that she needs to do some work on her theory to help with sight reading. Anyone have any recommendations viz music theory iphone apps?? I thought that she might enjoy one. Thanks