She has plenty of time to catch up her reading providing she practices. Use her love of music to help explain this to her. Like when she is trying to learn a new piece of music, she practices and practices until she gets better at it.
Kids that have the discipline for music often do well at other things.
From talking to friends, it appears lots of kids go off reading for a bit until they find something they enjoy. My DD is 10 and 2-3yrs ahead of where she needs to be, but I think at 6 she was behind and getting her to sit down with Biff, Chip and Kipper was like pulling teeth - for me and her!
What's her favourite song to play? Can she read the lyrics of that? Try comics, reading ingredients when making cakes, signs as you walk down the road, reviews of her favourite TV shows. Wordsearches and word games. Anything that makes reading part of everyday life.
She should read everyday, so it becomes a habit, but it doesn't have to be a painful one.
If she has a reading log with school, record all the reading she does in that, even if it's not the 'official' book, so she can see what she's achieved, rather than it being a reminder of what she hasn't done.
Might be worth checking with her teacher that she is on track with reading and if not, ask their advice.