App for learning musical notation?

[neolara]

My dd, aged 10, has suddenly become keen on playing the piano. She had lessons a few years ago but failed to learn to read music properly. Does anyone know of of a child friendly app where she could develop her fluency in reading music?

I found these for ios.

itunes.apple.com/gb/app-bundle/learn-to-read-music-for-kids!/id938001642?mt=8.

itunes.apple.com/gb/app/rhythm-cat-lite-hd-learn-to/id505012140?mt=8 (this is a demo version, dd has the full version and liked it, there are more in the series but I've not tried them yet.

Thank you. They look great but unfortunately I have an android phone, not an iPhone, so it looks like they won't work for us.

Any other ideas?