I agree with Elis reading and vocab. At the school I volunteered in they would study say The Iron Giant and then they would get the class to suggest good descriptive words, so instead of big the could have huge, girnormous etc and they would then all be given the opportunity to use better word choices in their work as they were written on the board. This meant they were given them on a plate and not have to think about them. They call it being a magpie.
You could try that when she is reading, pick a word, get her to think of one to two better ones, you can look up synonyms together online. Mine also used to read the dictionary for fun, get them to realise how many words they know already. Listen to her read, ask her questions like why does Ron do that, or what do you think Harry is feeling right now? What do you think might happen next? Although lots of children can read, comprehension is more difficult. They read things without understanding them, ie in book 1 they find Neville lives with his Grandparents but most children just accept it and don't ask why that would be.
Game strategy, something like Castle Panic, Forbidden Island or any co-op game where you all work together to win rather than against each other. They might be a bit too old but you can watch how to play on Youtube, far better than reading the how to play instructions.
Re music lessons in school, drop them, they take them out of class and depending which class they could be missing core subjects. It isn't important in school I think they get far more benefit from private lessons than group lessons or just playing for fun. Youtube has loads of videos on how to play songs, if she wants to do that then she will. Ds is self taught both piano and guitar via Youtube, he didn't want to sit exams, just happy to learn songs.
I completely agree with cariadlet DCs went to an outstanding school, homework was just read for 5 minutes a day, times tables, it isn't working it out but knowing the answer just like you know the words to a song and what comes next, the quicker you can answer maths questions the more you answer and the higher the mark. Plus around 8 spellings every week too.